- Albee, Howard F., 1968, Geologic map of the Munger Mountain quadrangle, Teton and Lincoln Counties, Wyoming: Geologic Quadrangle 705, 1 map :col. ;58 x 42 cm.,
- Amos, Dewey Harold; Finch, Warren Irvin, 1968, Geologic map of the Calvert City quadrangle, Livingston and Marshall Counties, Kentucky: Geologic Quadrangle 731, 1 map :col. ;89 x 99 cm.,
- Barr, J. L.; Arndt, Harold H., 1968, Geologic map of the Dorton quadrangle, Pike County, Kentucky: Geologic Quadrangle 713, 1 map.,
- Bayley, Richard W., 1968, Geologic map of the Bradley Peak quadrangle, Carbon County, Wyoming: Geologic Quadrangle 773, 1 map.,
- Black, Douglas F. B., 1968, Geologic map of the Ford quadrangle, central Kentucky: Geologic Quadrangle 764, 1 map.,
- Brock, M. R.; Singewald, Q. D., 1968, Geologic map of the Mount Tyndall quadrangle, Custer County, Colorado: Geologic Quadrangle 596, 2 maps :1 col. ;each 57 x 45 cm., folded to 27 x 18 cm., in envelope 30 x 24 cm. + 1 pamphlet (5 p. ; 27 cm.),
- Brokaw, Arnold Leslie; Barosh, Patrick James, 1968, Geologic map of the Riepetown quadrangle, White Pine County, Nevada: Geologic Quadrangle 758, 1 map.,
- Christiansen, Robert L.; Noble, Donald C., 1968, Geologic map of the Trail Ridge quadrangle, Nye County, Nevada: Geologic Quadrangle 774, 1 map.,
- Colton, Roger B., 1968, Surficial geologic map of the West Torrington quadrangle, Litchfield County, Connecticut: Geologic Quadrangle 727, 1 map.,
- Cressman, Earle Rupert, 1968, Geologic map of the Salvisa quadrangle, central Kentucky: Geologic Quadrangle 760, 1 map.,
- Cullins, Henry L.; Dyni, John R., 1968, Geologic map of the Banty Point quadrangle, Rio Blanco County, Colorado: Geologic Quadrangle 703, 1 map :col. ;58 x 44 cm. folded to 28 x 21 cm. in envelope 30 x 24 cm.,
- Dixon, H. Roberta., 1968, Bedrock geologic map of the Danielson quadrangle, Windham County, Connecticut: Geologic Quadrangle 696, 1 map.,
- Durham, David L., 1968, Geologic map of the Adelaida quadrangle, San Luis Obispo County, California: Geologic Quadrangle 768, 1 map.,
- Dyni, John R., 1968, Geologic map of the Elk Springs quadrangle, Moffatt County, Colorado: Geologic Quadrangle 702, 1 map :col. ;45 x 34 cm., on sheet 79 x 80 cm., folded to 27 x 20 cm., in envelope 30 x 24 cm.,
- Englund, Kenneth John, 1968, Geologic map of the Bramwell quadrangle, West Virginia-Virginia: Geologic Quadrangle 745, 1 map.,
- Finch, Warren Irvin, 1968, Geologic map of the Lovelaceville quadrangle, western Kentucky: Geologic Quadrangle 763, 1 map.,
- Gibbons, A. B., 1968, Geologic map of the Mays Lick quadrangle, Mason County, Kentucky: Geologic Quadrangle 784, 1 map.,
- Gildersleeve, Benjamin, 1968, Geologic map of the Quality quadrangle, Butler and Logan Counties, Kentucky: Geologic Quadrangle 673, 1 map :col. ;58 x 74 cm.,
- Gildersleeve, Benjamin, 1968, Geologic map of the Bee Spring quadrangle, Edmonson and Grayson Counties, Kentucky: Geologic Quadrangle 757, 1 map :col. ;58 x 46 cm.,
- Godwin, Larry H., 1968, Geologic map of the Chair Mountain quadrangle, Gunnison and Pitkin Counties, Colorado: Geologic Quadrangle 704, 1 map :col. ;58 x 45 cm., folded to 29 x 20 cm., in envelope 30 x 24 cm.,
- Goudarzi, Gus H., 1968, Geologic map of the Hartford quadrangle, Ohio County, Kentucky: Geologic Quadrangle 741, 1 map :col. ;85 x 84 cm.,
- Goudarzi, Gus H.; Smith, Avery E., 1968, Geologic map of the Dundee quadrangle, Ohio County, Kentucky: Geologic Quadrangle 688, 1 map :col. ;80 x 98 cm.,
- Goudarzi, Gus H.; Smith, Avery E., 1968, Geologic map of the Pleasant Ridge quadrangle, Ohio and Daviess Counties, Kentucky: Geologic Quadrangle 766, 1 map :col. ;81 x 90 cm.,
- Greene, Robert C., 1968, Geologic map of the Moberly quadrangle, Madison and Estill Counties, Kentucky: Geologic Quadrangle 664, 1 map.,
- Greene, Robert C., 1968, Geologic map of the Panola quadrangle, Estill and Madison Counties, Kentucky: Geologic Quadrangle 686, 1 map :col. ;79 x 109 cm.,
- Gualtieri, James Louis, 1968, Geologic map of the Wildie quadrangle, Garrard and Rockcastle Counties, Kentucky: Geologic Quadrangle 684, 1 map :col. ;79 x 104 cm.,
- Gualtieri, James Louis, 1968, Geologic map of the Johnetta quadrangle, Rockcastle and Jackson Counties, Kentucky: Geologic Quadrangle 685, 1 map :col. ;79 x 107 cm.,
- Hansen, Wallace R., 1968, Geologic map of the Black Ridge quadrangle, Delta and Montrose Counties, Colorado: Geologic Quadrangle 747, 1 map :col. ;58 x 45 cm., on sheet 84 x 94 cm., folded to 28 x 19 cm., in envelope 30 x 24 cm.,
- Hanshaw, P. M., 1968, Bedrock geologic map of the Meriden quadrangle, New Haven, Hartford, and Middlesex Counties, Connecticut: Geologic Quadrangle 738, 1 map.,
- Hatch, Norman L.; Hartshorn, Joseph H., 1968, Geologic map of the Heath quadrangle, Massachusetts and Vermont: Geologic Quadrangle 735, 1 map.,
- Hinrichs, E. Neal, 1968, Geologic map of the Camp Desert Rock quadrangle, Nye County, Nevada: Geologic Quadrangle 726, 1 map.,
- Huber, N. King, 1968, Geologic map of the Shuteye Peak quadrangle, Sierra Nevada, California: Geologic Quadrangle 728, 1 map. 24 by 32 inches. Accompanied by 4-page text.,
- Hyden, Harold Julius; Houston, Robert Stroud; King, John S., 1968, Geologic map of the White Rock Canyon quadrangle, Carbon County, Wyoming: Geologic Quadrangle 789, 1 map.,
- Johnson, William D.; Smith, Avery E., 1968, Geologic map of the Olaton quadrangle, western Kentucky: Geologic Quadrangle 687, 1 map.,
- Johnson, William D.; Smith, Avery E., 1968, Geologic map of part of the Owensboro East quadrangle in Daviess County, Kentucky: Geologic Quadrangle 751, 1 map :col. ;84 x 87 cm.,
- Kehn, Thomas M., 1968, Geologic map of the Graham quadrangle, western Kentucky: Geologic Quadrangle 765, 1 map.,
- Kepferle, Roy Clark, 1968, Geologic map of the Shepherdsville quadrangle, Bullitt County, Kentucky: Geologic Quadrangle 740, 1 map :col. ;79 x 104 cm.,
- Klemic, Harry; Ulrich, George E.; Moore, Samuel L., 1968, Geologic map of part of the Johnson Hollow quadrangle, Trigg County, Kentucky: Geologic Quadrangle 722, 1 map.,
- Koteff, Carl; Oldale, Robert N.; Hartshorn, Joseph H., 1968, Geologic map of the Monomoy Point quadrangle, Barnstable County, Cape Cod, Massachusetts: Geologic Quadrangle 787, 1 map.,
- Krieger, Medora Louise Hooper, 1968, Geologic map of the Brandenburg Mountain quadrangle, Pinal County, Arizona: Geologic Quadrangle 668, 1 map.,
- Krieger, Medora Louise Hooper, 1968, Geologic map of the Holy Joe Peak quadrangle, Pinal County, Arizona: Geologic Quadrangle 669, 1 map.,
- Krieger, Medora Louise Hooper, 1968, Geologic map of the Lookout Mountain quadrangle, Pinal County, Arizona: Geologic Quadrangle 670, 1 map.,
- Krieger, Medora Louise Hooper, 1968, Geologic map of the Saddle Mountain quadrangle, Pinal County, Arizona: Geologic Quadrangle 671, 1 map.,
- MacQuown, William Charles, 1968, Geologic map of the Clintonville quadrangle, central Kentucky: Geologic Quadrangle 717, 1 map.,
- MacQuown, William Charles, 1968, Geologic map of the Nicholasville quadrangle, Jessamine and Fayette Counties, Kentucky: Geologic Quadrangle 767, 1 map.,
- MacQuown, William Charles; Dobrovolny, Ernest, 1968, Geologic map of the Lexington East quadrangle, Fayette and Bourbon Counties, Kentucky: Geologic Quadrangle 683, 1 map.,
- Malde, Harold E., 1968, Surficial geologic map of the Norwalk South quadrangle, Fairfield County, Connecticut: Geologic Quadrangle 718, 1 map.,
- McKee, Edwin H., 1968, Geologic map of the Ackerman Canyon quadrangle, Lander and Eureka Counties, Nevada: Geologic Quadrangle 761, 1 map.,
- McKee, Edwin H., 1968, Geologic map of the Spencer Hot Springs quadrangle, Lander County, Nevada: Geologic Quadrangle 770, 1 map.,
- Miller, R. C., 1968, Geologic map of the Russellville quadrangle, Logan County, Kentucky: Geologic Quadrangle 714, 1 map.,
- Moore, Frank Baker, 1968, Geologic map of the Hodgenville quadrangle, Laure and Nelson Counties, Kentucky: Geologic Quadrangle 749, 1 map.,
- Moore, Samuel L., 1968, Geologic map of the Pembroke quadrangle, Christian and Todd Counties, Kentucky: Geologic Quadrangle 709, 1 map.,
- Moore, Samuel L., 1968, Geologic map of the Exie quadrangle, Green County, Kentucky: Geologic Quadrangle 752, 1 map :col. ;79 x 79 cm.,
- Mudge, Melville Rhodes, 1968, Bedrock geologic map of the Castle Reef quadrangle, Teton and Lewis and Clark Counties, Montana: Geologic Quadrangle 711, 1 map.,
- Nelson, Willis H.; Seeland, David Arthur, 1968, Geologic map of the Gracey quadrangle, Trigg and Christian Counties, Kentucky: Geologic Quadrangle 753, 1 map :col. ;78 x 83 cm.,
- Oldale, Robert N., 1968, Geologic map of the Wellfleet quadrangle, Barnstable County, Cape Cod, Massachusetts: Geologic Quadrangle 750, 1 map.,
- Olive, Wilds W.; Davis, R. W., 1968, Geologic map of the Oak Level quadrangle, Western Kentucky: Geologic Quadrangle 744, 1 map.,
- Orkild, Paul P., 1968, Geologic map of the Mine Mountain quadrangle, Nye County, Nevada: Geologic Quadrangle 746, 1 map.,
- Outerbridge, William F., 1968, Geologic map of the David quadrangle, eastern Kentucky: Geologic Quadrangle 720, 1 map :col. ;79 x 89 cm.,
- Outerbridge, William F., 1968, Geologic map of parts of the Majestic-Hurley and Wharncliffe quadrangles, Pike County, Kentucky: Geologic Quadrangle 748, 1 map.,
- Outerbridge, William F.; Vloten, Roger Van, 1968, Geologic map of part of the Jamboree quadrangle, Pike County, Kentucky: Geologic Quadrangle 775, 1 map.,
- Palmer, James Edward, 1968, Geologic map of the Nortonville quadrangle, Hopkins and Christian Counties, Kentucky: Geologic Quadrangle 762, 1 map.,
- Peterson, Warren Lee, 1968, Geologic map of the Cravens quadrangle, Bullitt and Nelson Counties, Kentucky: Geologic Quadrangle 737, 1 map :col. ;78 x 94 cm.,
- Pierce, William Gamewell; Nelson, Willis H., 1968, Geologic map of the Pat O‘Hara Mountain quadrangle, Park County, Wyoming: Geologic Quadrangle 755, 1 map :col. ;44 x 32 cm. on sheet 84 x 68 cm. folded in envelope 30 x 24 cm.,
- Pipiringos, G. N.; Bergman, S. C.; Trent, Virgil A., 1968, Geologic map of the Ezel quadrangle, Morgan and Menifee Counties, Kentucky: Geologic Quadrangle 721, 1 map :col. ;84 x 94 cm.,
- Pomeroy, John S., 1968, Geologic map of the Frankfort East quadrangle, Franklin and Woodford Counties, Kentucky: Geologic Quadrangle 707, 1 map.,
- Prostka, Harold J.; Seiders, Victor M., 1968, Geologic map of the Leatherwood quadrangle, southeastern Kentucky: Geologic Quadrangle 723, 1 map :col. ;79 x 87 cm.,
- Randall, Allan D.; Pessl, Fred, 1968, Surficial geologic map of the Danielson quadrangle, Windham County, Connecticut: Geologic Quadrangle 660, 1 map.,
- Reynolds, Mitchell W., 1968, Geologic map of the Muddy Gap quadrangle, Carbon County, Wyoming: Geologic Quadrangle 771, 1 map :col. ;58 x 43 cm. on sheet 79 x 84 cm.,
- Reynolds, Mitchell W., 1968, Geologic map of the Whiskey Peak quadrangle, Carbon, Fremont and Sweetwater counties, Wyoming: Geologic Quadrangle 772, 1 map :col. ;57 x 43 cm., sheet 84 x 86 cm.,
- Rice, Charles L., 1968, Geologic map of the Redbush quadrangle, eastern Kentucky: Geologic Quadrangle 708, 1 map :col. ;58 x 46 cm.,
- Rice, Charles L., 1968, Geologic map of the McDowell quadrangle, Floyd and Pike Counties, Kentucky: Geologic Quadrangle 732, 1 map.,
- Roen, John B.; Kent, Bion H.; Schweinfurth, Stanley P., 1968, Geologic map of the Monongahela quadrangle, southwestern Pennsylvania: Geologic Quadrangle 743, 1 map.,
- Rohrer, Willis L., 1968, Geologic map of the Fish Lake quadrangle, Fremont County, Wyoming: Geologic Quadrangle 724, 1 map.,
- Ruppel, Edward Thompson, 1968, Geologic map of the Leadore quadrangle, Lemha County, Idaho: Geologic Quadrangle 733, 1 map.,
- Schafer, John Phillip, 1968, Surficial geologic map of the Ashaway quadrangle, Connecticut-Rhode Island: Geologic Quadrangle 712, 1 map.,
- Scott, Glenn Robert; MacCary, L. M., 1968, Geologic map of the Hardin quadrangle, Marshall County, Kentucky: Geologic Quadrangle 759, 1 map.,
- Seeland, David, 1968, Geologic map of part of the Repton quadrangle in Crittenden County, Kentucky: Geologic Quadrangle 754, 1 map :col. ;58 x 46 cm.,
- Seeland, David A., 1968, Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky: Geologic Quadrangle 710, 1 map :col. ;79 x 84 cm.,
- Shawe, Fred R., 1968, Geologic map of the Riverside quadrangle, Butler and Warren Counties, Kentucky: Geologic Quadrangle 736, 1 map :col. ;79 x 90 cm.,
- Simpson, Howard E., 1968, Surficial geologic map of the Durham quadrangle, Middlesex and New Haven Counties, Connecticut: Geologic Quadrangle 756, 1 map.,
- Skipp, Betty; Hepp, Mary-Margaret, 1968, Geologic map of the Hatfield Mountain quadrangle, Gallatin County, Montana: Geologic Quadrangle 729, 1 map.,
- Soister, Paul E., 1968, Geologic map of the Hanover NW quadrangle, El Paso County, Colorado: Geologic Quadrangle 725, 1 map :col. ;58 x 44 cm., folded to 29 x 20 cm., in envelope 30 x 24 cm.,
- Soister, Paul E., 1968, Geologic map of the Corral Bluffs quadrangle, El Paso County, Colorado: Geologic Quadrangle 783, 1 map :col. ;58 x 45 cm. folded to 26 x 22 cm. in envelope 30 x 24 cm.,
- Stewart, John Harris; McKee, Edwin H., 1968, Geologic map of the Mount Callaghan quadrangle, Lander County, Nevada: Geologic Quadrangle 730, 1 map.,
- Taylor, Alfred R.; Luft, Stanley Jeremie; Lewis, Richard Quintin, 1968, Geologic map of the Greensburg quadrangle, Green and Taylor Counties, Kentucky: Geologic Quadrangle 739, 1 map :col. ;79 x 84 cm.,
- Trace, Robert Denny; Kehn, Thomas M., 1968, Geologic map of the Olney quadrangle, Caldwell and Hopkins Counties, Kentucky: Geologic Quadrangle 742, 1 map :col. ;78 x 94 cm.,
- Trexler, J. Peter; Wood, Gordon H., 1968, Geologic map of the Valley View quadrangle, Schuylkill, and Northumberland Counties, Pennsylvania: Geologic Quadrangle 699, 1 map.,
- Trexler, J. Peter; Wood, Gordon H., 1968, Geologic map of the Klingerstown quadrangle, Northumberland, Schuylkill, and Dauphin Counties, Pennsylvania: Geologic Quadrangle 700, 1 map.,
- Trexler, J. Peter; Wood, Gordon H., 1968, Geologic map of the Lykens quadrangle, Dauphin, Schuylkill, and Lebanon Counties, Pennsylvania: Geologic Quadrangle 701, 1 map.,
- Weis, Paul L., 1968, Geologic map of the Greenacres quadrangle, Washington and Idaho: Geologic Quadrangle 734, 1 map.,
- Wood, G. H., Jr.; Trexler, J. P.; Yelenosky, Andy, 1968, Geologic map of the Minersville quadrangle, Schuylkill County, Pennsylvania: Geologic Quadrangle 690, 1 map. 28 by 46 inches,
- Wood, Gordon H., 1968, Geologic map of the Tower City quadrangle, Schuylkill, Dauphin and Lebanon Counties, Pennsylvania: Geologic Quadrangle 698, 1 map.,
- Wood, Gordon H.; Kehn, Thomas M., 1968, Geologic map of the Swatara Hill quadrangle, Schuylkill and Berks Counties, Pennsylvania: Geologic Quadrangle 689, 1 map.,
- Wood, Gordon H.; Kehn, Thomas M., 1968, Geologic map of the Pine Grove quadrangle, Schuylkill, Lebanon, and Berks Counties, Pennsylvania: Geologic Quadrangle 691, 1 map.,
- Wood, Gordon H.; Trexler, J. Peter, 1968, Geologic map of the Tremont quadrangle, Schuylkill and Northumberland Counties, Pennsylvania: Geologic Quadrangle 692, 1 map.,
