- Briggs, R. P., 1968, Geologic map of the Arecibo quadrangle, Puerto Rico: IMAP 551, 1 map.,
- Brown, Glen F.; Jackson, Roy O., 1968, Geographic map of the Asir quadrangle, Kingdom of Saudi Arabia: IMAP 217-B, 1 map :col. ;on sheet 88 x 65 cm.,
- Carlson, J. E.; Willden, Ronald, 1968, Transcontinental geophysical survey (35-39 N.) geologic map from 112 W. longitude to the coast of California: IMAP 532-C, 1 map :col. ;71 x 150 cm.,
- Carlson, J. E.; Willden, Ronald, 1968, Transcontinental geophysical survey (35-39 N.) geologic map from 100 to 112 W. longitude: IMAP 533-C, 1 map :col. ;44 x 112 cm.,
- compiled by the U.S. Air Force Aeronautical Chart and Information Center, 1968, Transcontinental geophysical survey (35-39 N.) Bouguer gravity map from 112 W. longitude to the coast of California: IMAP 532-B, 1 map.,
- compiled by the U.S. Air Force Aeronautical Chart and Information Center, 1968, Transcontinental geophysical survey (35-39 N.) Bouguer gravity map from 100 to 112 W. longitude: IMAP 533-B, 1 map.,
- compiled by the U.S. Air Force Aeronautical Chart and Information Center, 1968, Transcontinental geophysical survey (35-39 N.) Bouguer gravity map from 87 to 100 W. longitude: IMAP 534-B, 1 map.,
- compiled by the U.S. Air Force Aeronautical Chart and Information Center, 1968, Transcontinental geophysical survey (35-39 N.) Bouguer gravity map from 74 to 87 W. longitude: IMAP 535-B, 1 map ;44 x 117 cm.,
- Cummings, David, 1968, Geologic map of the Zuni Salt Lake volcanic crater, Catron County, New Mexico: IMAP 544, 1 map :col. ;59 x 51 cm.,
- Dibblee, T. W, Jr., 1968, Geologic map of the Twentynine Palms quadrangle, San Bernardino and Riverside Counties, California: IMAP 561, 1 map :col. ;76 x 55 cm. folded to 29 x 22 cm. in envelope 31 x 25 cm. +1 text (3 leaves ; 28 cm.),
- Fernald, A. T.; Corchary, G. S.; Williams, W. P., 1968, Surficial geologic map of Yucca Flat, Nye and Lincoln Counties, Nevada: IMAP 550, 1 map :col. ;86 x 70 cm. folded in envelope 30 x 24 cm.,
- Harshman, E. N., 1968, Geologic map of the Shirley Basin area, Albany, Carbon, Converse, and Natrona Counties, Wyoming: IMAP 539, 1 map :col. ;58 x 86 cm. Reprinted 1979.,
- Hayes, P. T.; Raup, R. B., 1968, Geologic map of the Huachuca and Mustang Mountains, southeastern Arizona: IMAP 509, 1 map :col. ;96 x 74 cm. folded in envelope 30 x 24 cm.,
- Higgins, M. W., 1968, Geologic map of the Brevard fault zone near Atlanta, Georgia: IMAP 511, 1 map :col. ;on sheet 126 x 104 cm. fold. in envelope 30 x 24 cm.,
- Hinrichs, E. N.; Krummel, W. J., Jr.; Moore, H. J.; Connor, J. J., 1968, Geologic map of the northeast quarter of the Hatch Point quadrangle, San Juan County, Utah: IMAP 526, 1 map.,
- Hoare, J. M.; Condon, W. H., 1968, Geologic map of the Hooper Bay quadrangle, Alaska: IMAP 523, 1 map.,
- Howard, K. A.; Masursky, Harold, 1968, Geologic map of the Ptolemaeus Quadrangle of the moon: IMAP 566, 1 map :col. ;48 x 60 cm. on sheet 76 x 136 cm. fold. in envelope 30 x 24 cm.,
- Lattimore, R. K.; Bush, S. A.; Bush, P. A., 1968, Transcontinental geophysical survey (35-39 N.) gravity and bathymetric map from the coast of California to 133 W. longitude: IMAP 531-B, 1 map ;65 x 132 cm.,
- Lattimore, R. K.; Bassinger, B. G.; DeWald, Omar, 1968, Transcontinental geophysical survey (35-39 N.) magnetic map from the coast of California to 133 W. longitude: IMAP 531-A, 1 map ;65 x 129 cm.,
- Marvin, R. R., 1968, Transcontinental geophysical survey (35-39 N.) radiometric age determinations of rocks: IMAP 537, 4 maps on 1 sheet ;8 x 60 cm., sheet 68 x 78 cm. folded in envelope 30 x 24 cm. +1 text (25 p.),
- Mattson, P. H., 1968, Geologic map of the Adjuntas quadrangle, Puerto Rico: IMAP 519, 1 map.,
- Mattson, P. H., 1968, Geologic map of the Jayuya quadrangle, Puerto Rico: IMAP 520, 1 map.,
- Milton, D. J., 1968, (LAC-78) Geologic map of the Theophilus quadrangle of the moon: IMAP 546, 1 map :col. ;on sheet 74 x 122 cm., folded in envelope 30 x 24 cm.,
- Nelson, A. E.; Tobisch, O. T., 1968, Geologic map of the Bayaney quadrangle, Puerto Rico: IMAP 525, 1 map.,
- Nichols, W. D., 1968, Bedrock topography of eastern Morris and western Essex Counties, New Jersey: IMAP 549, 1 map.,
- Noble, D. C.; Christiansen, R. L., 1968, Geologic map of the southwest quarter of the Black Mountain quadrangle, Nye County, Nevada: IMAP 562, 1 map.,
- Patton, W. W., Jr.; Miller, T. P., 1968, Regional geologic map of the Selawik and southeastern Baird Mountains quadrangle, Alaska: IMAP 530, 1 map.,
- Patton, W. W., Jr.; Miller, T. P.; Tailleur, I. L., 1968, Regional geologic map of the Shunknak and southern part of the Ambler River quadrangles, Alaska: IMAP 554, 1 map.,
- Pease, M. H., Jr., 1968, Geologic map of the Aguas Buenas quadrangle, Puerto Rico: IMAP 479, 1 map.,
- Pease, M. H., Jr., 1968, Geologic map of the Naranjito quadrangle, Puerto Rico: IMAP 508, 1 map.,
- Rogers, C. L.; Ekren, E. B.; Noble, D. C.; Weir, J. E., 1968, Geologic map of the northern half of the Black Mountain quadrangle, Nye County, Nevada: IMAP 545, 1 map.,
- Schmidt, R. G.; Strong, C. P., Jr., 1968, Preliminary geologic map of the Roberts Mountain quadrangle, Lewis and Clark County, Montana: IMAP 564, 1 map ;58 x 40 cm. folded in envelope 30 x 24 cm.,
- Scott, G. R., 1968, Geologic and structure contour map of the La Junta quadrangle, Colorado and Kansas: IMAP 560, 1 map :col. ;71 x 45 cm. folded to 28 x 22 cm. in envelope 30 x 24 cm.,
- Segerstrom, Kenneth, 1968, Geochemical prospecting for copper, lead, and zinc in the west-central part of the Negaunee quadrangle, Marquette County, Michigan: IMAP 559, 1 map.,
- Swinney, C. M.; Waters, A. C.; Miller, C. P., 1968, Reconnaissance geologic map of the Lookout Mountain quadrangle, Crook and Wheeler Counties, Oregon: IMAP 543, 1 map.,
- Uchupi, Elazar, 1968, Map showing relation of land and submarine topography, Mississippi Delta to Bahia de Campeche: IMAP 521, 1 map in 2 sections :col. ;78 x 92 cm. and 67 x 96 cm.,
- Vedder, J. G., 1968, Geologic map of Fox Mountain quadrangle, Santa Barbara County, California: IMAP 547, 1 map.,
- Warren, D. H., 1968, Transcontinental geophysical survey (35-39 N.) seismic refraction profiles of the crust and upper mantle from 112 W. longitude to the coast of California: IMAP 532-D, 1 map ;76 x 137 cm. +1 booklet (4 p.),
- Warren, D. H., 1968, Transcontinental geophysical survey (35-39 N.) seismic refraction profiles of the crust and upper mantle from 100 to 112 W. longitude: IMAP 533-D, 1 map profile ;64 x 103 cm. +text (4 p.),
- Warren, D. H., 1968, Transcontinental geophysical survey (35-39 N.) seismic refraction profiles of the crust and upper mantle from 87 to 100 W. longitude: IMAP 534-D, 1 map profile ;57 x 112 cm. +text (4 p.),
- Warren, D. H., 1968, Transcontinental geophysical survey (35-39 N.) seismic refraction profiles of the crust and upper mantle from 74 to 87 W. longitude: IMAP 535-D, 1 map profile ;50 x 112 cm. +text (4 p.),
- Waters, A. C., 1968, Reconnaissance geologic map of the Post quadrangle, Crook County, Oregon: IMAP 542, 1 map.,
- Waters, A. C., 1968, Reconnaissance geologic map of the Madras quadrangle, Jefferson and Wasco Counties, Oregon: IMAP 555, 1 map :col. ;45 x 32 cm. folded in envelope 30 x 24 cm.,
- Waters, A. C., 1968, Reconnaissance geologic map of the Dufur quadrangle, Hood River, Sherman, and Wasco Counties, Oregon: IMAP 556, 1 map :col. ;45 x 32 cm. folded in envelope 30 x 24 cm.,
- Waters, A. C.; Vaughan, R. H., 1968, Reconnaissance geologic map of the Eagle Rock quadrangle, Crook County, Oregon: IMAP 540, 1 map :col. ;45 x 32 cm. folded in envelope 30 x 24 cm.,
- Waters, A. C.; Vaughan, R. H., 1968, Reconnaissance geologic map of the Ochoco Reservoir quadrangle, Crook County, Oregon: IMAP 541, 1 map.,
- Wilhelms, D. E., 1968, (LAC-59) Geologic map of the Mare Vaporum quadrangle of the moon: IMAP 548, 1 map :col. ;48 x 58 cm. on sheet 86 x 137 cm. fold. in envelope 30 x 24 cm.,
- Willden, Ronald; Carlson, J. E., 1968, Transcontinental geophysical survey (35-39 N.) geologic map from 87 to 100 W. longitude: IMAP 534-C, 1 map :col. ;44 x 112 cm.,
- Willden, Ronald; Reed, J. C., Jr.; Carlson, J. E., 1968, Transcontinental geophysical survey (35-39 N.) geologic map from the East Coast of the United States to 87 W. longitude: IMAP 535-C, 1 map :col. ;44 x 112 cm.,
- Wood, G. H., Jr.; Trexler, J. P., 1968, Geologic maps of anthracite-bearing rocks in the west-central part of the southern anthracite field, Pennsylvania, western area: IMAP 529, 1 map on 3 sheets :col. ;125 x 176 cm., sheets 81 x 99 cm. folded in envelope 30 x 24 cm.,
- Wood, Gordon H., Jr.; Trexler, Peter; Kehn, Thomas M., 1968, Geological maps of anthracite-bearing rocks in the west-central part of the southern anthracite field, Pennsylvania, eastern area: IMAP 528, 1 map on 6 sheets.,
- Zietz, Isidore; Kirby, J. R., 1968, Transcontinental geophysical survey (35 degrees-39 degrees N.) magnetic map from 112 degrees W. longitude to the coast of California: IMAP 532-A, 1 map ;155 x 66 cm. folded in 25 x 31 cm. envelope.,
- Zietz, Isidore; Kirby, J. R., 1968, Transcontinental geophysical survey (35-39 N.) magnetic map from 100 to 112 W. longitude: IMAP 533-A, 1 map ;44 x 112 cm.,
- Zietz, Isidore; Kirby, J. R., 1968, Transcontinental geophysical survey (35-39 N.) magnetic map from 87 to 100 W. longitude: IMAP 534-A, 1 map ;44 x 112 cm.,
- Zietz, Isidore; Kirby, J. R.; Stockard, H. P., 1968, Transcontinental geophysical survey (35-39 N.) magnetic and bathymetric map from 74 to 87 W. longitude: IMAP 535-A, 1 map ;155 x 66 cm. folded in 25 x 31 cm. envelope.,
- Zietz, Isidore; Stockard, H. P.; Kirby, J. R., 1968, Transcontinental geophysical survey (35-39 N.) magnetic and bathymetric map from 63 to 74 W. longitude: IMAP 536, 1 map :col. ;74 x 95 cm.,
