- Anderson, B. A.; Ham, C. B., 1968, Index of surface-water records to September 30, 1967 - Part 1, North Atlantic slope basins: U.S. Dept. of the Interior, Geological Survey, Circular 571, 87 p. :ill., map ;26 cm.,
- Anderson, B. A.; Ham, C. B., 1968, Index of surface-water records to September 30, 1967 - Part 2, South Atlantic slope and eastern Gulf of Mexico basins: U.S. Dept. of the Interior, Geological Survey, Circular 572, 85 p. :ill., map ;26 cm.,
- Anderson, B. A.; Ham, C. B., 1968, Index of surface-water records to September 30, 1967 - Part 3, Ohio River basin: U.S. Dept. of the Interior, Geological Survey, Circular 573, 66 p. :ill., map ;26 cm.,
- Anderson, B. A.; Ham, C. B., 1968, Index of surface-water records to September 30, 1967 - Part 4, St. Lawrence River basin: U.S. Dept. of the Interior, Geological Survey, Circular 574, 39 p. :ill., map ;26 cm.,
- Bauer, Daniel P., 1968, Time of travel of water in the Great Miami River, Dayton to Cleves, Ohio: [U. S. Dept. of the Interior], Circular 546, iii, 15 p. :illus.,
- Clifton, H. Edward, 1968, Gold distribution in surface sediments on the continental shelf off southern Oregon-A preliminary report: [U.S. Geological Survey], 1968 Circular 587, iii, 6 p. :illus., maps. ;27 cm.,
- Curtin, Gary C.; Lakin, H. W.; Neuerburg, G. J.; Hubert, A. E., 1968, Utilization of humus-rich forest soil (mull) in geochemical exploration for gold: [U.S. Govt. Print. Off.], Circular 562, iii, 11 p. :illus., maps. ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 5, Hudson Bay and upper Mississippi River basins: U.S. Dept. of the Interior, Geological Survey, Circular 575, 64 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 6, Missouri River basin: U.S. Dept. of the Interior, Geological Survey, Circular 576, 84 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 7, Lower Mississippi River basin: U.S. Dept. of the Interior, Geological Survey, Circular 577, 66 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 8, Western Gulf of Mexico basins: U.S. Dept. of the Interior, Geological Survey, Circular 578, 51 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 9, Colorado River basin: [U.S. Govt. Print. Off.], Circular 579, 53 p. :illus.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 10, The Great Basin: U.S. Dept. of the Interior, Geological Survey, Circular 580, 37 p. ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 11, Pacific slope basins in California: U.S. Dept. of the Interior, Geological Survey, Circular 581, 52 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 12, Pacific slope basins in Washington and upper Columbia River basin: U.S. Dept. of the Interior, Geological Survey, Circular 582, 39 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 13, Snake River basin: U.S. Dept. of the Interior, Geological Survey, Circular 583, 29 p. :ill., map ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Part 14, Pacific slope basins in Oregon and lower Columbia River basin: U.S. Dept. of the Interior, Geological Survey, Circular 584, 30 p. ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Alaska: U.S. Dept. of the Interior, Geological Survey, Circular 585, 18 p. ;26 cm.,
- Eisenhuth, H. P., 1968, Index of surface-water records to September 30, 1967 - Hawaii and other Pacific areas: U.S. Dept. of the Interior, Geological Survey, Circular 586, 25 p. ;26 cm.,
- Eisenlohr, William Stewart; Sloan, Charles E., 1968, Generalized hydrology of prairie potholes on the Coteau du Missouri, North Dakota: [U.S. Geological Survey], Circular 558, v, 12 p. :illus., map. ;26 cm.,
- Elliott, James E.; Wells, John David, 1968, Anomalous concentrations of gold, silver, and other metals in the Mill Canyon area, Cortez quadrangle, Eureka and Lander Counties, Nevada: [U.S. Dept. of the Interior, Geological Survey], Circular 606, iii, 20 p. :illus., maps. ;26 cm.,
- Emmett, William W.; Hadley, R. F., 1968, The Vigil Network: Preservation and access of data: U.S. Geological Survey, Circular 460-C, iii, 21 p. :maps ;26 cm.,
- Fischer, Richard Philip; Fisher, Frederick S., 1968, Interpreting pan-concentrate analysis of stream sediments in geochemical exploration for gold: [U.S. Geological Survey], Circular 592, iii, 9 p. :illus., map. ;26 cm.,
- Foster, Robert Lutz, 1968, Potential for lode deposits in the Livengood gold placer district, east-central Alaska: U.S. Dept. of the Interior, Circular 590, iii, 18 p. :illus., maps. ;27 cm.,
- Geological Survey (U.S.), 1968, U.S. Geological Survey heavy metals program progress report, 1966 and 1967: The Survey, Circular 560, iii, 24 p. ;27 cm.,
- Gott, Garland Bayard; Zablocki, Charles J., 1968, Geochemical and geophysical anomalies in the western part of the Sheep Creek Range, Lander County, Nevada: [U.S. Geological Survey], Circular 595, iii, 17 p. :illus., maps. ;27 cm.,
- Griffitts, Wallace R.; Alminas, Henry V., 1968, Geochemical evidence for possible concealed mineral deposits near the Monticello Box, northern Sierra Cuchillo, Socorro County, New Mexico: [U.S. Geological Survey], Circular 600, iii, 13 p. :illus., maps. ;26 cm.,
- Grimes, D. J.; Marranzino, A. P., 1968, Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials: [U.S. Geological Survey], Circular 591, iii, 6 p. :illus. ;26 cm.,
- Hawley, C. C.; Clark, A. L., 1968, Occurrences of gold and other metals in the Upper Chulitna district, Alaska: [U.S. Geological Survey], Circular 564, 21 p. :ill., maps. ;26 cm.,
- Hawley, C. C.; Griffitts, Wallace R., 1968, Distribution of beryllium, tin, and tungsten in the Lake George area, Colorado: [U.S. Geological Survey], Circular 597, iii, 18 p. :maps. ;27 cm.,
- Hewett, D. F., 1968, Silver in veins of hypogene manganese oxides: [U.S. Geological Survey], Circular 553, iii, 9 p. :map. ;26 cm.,
- Jones, Robert Sprague, 1968, Gold in meteorites and in the earth‘s crust: [U.S. Geological Survey], Circular 603, iii, 4 p. ;26 cm.,
- Ketner, Keith Brindley; Evans, James George; Hessin, Thomas D., 1968, Geochemical anomalies in the Swales Mountain area, Elko County, Nevada: [U.S. Geological Survey], Circular 588, iii, 13 p. :illus., maps. ;27 cm.,
- Kinney, Douglas M.; Izett, G. A.; King, R. U.; Taylor, R. B., 1968, The Poison Ridge volcanic center and related mineralization, Grand and Jackson Counties, Colorado: [Geological Survey], Circular 594, iii, 8 p. :illus., maps. ;26 cm.,
- Leopold, Luna Bergere, 1968, Hydrology for urban land planning--A guidebook on the hydrologic effects of urban land use: [U.S. Geological Survey], Circular 554, iii, 18 p. :illus. ;26 cm.,
- MacKevett, E. M.; Smith, James G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: [U.S. Geological Survey], Circular 604, iii, 25 p. :maps. ;26 cm.,
- Miller, Thomas P.; Ferrians, Oscar J., 1968, Suggested areas for prospecting in the central Koyukuk River region, Alaska: U.S. Dept. of the Interior, Geological Survey, Circular 570, iii, 12 p. :ill., maps ;26 cm.,
- Moore, Albert M., 1968, Water temperatures in the lower Columbia River: U.S. Dept. of the Interior, Circular 551, iv, 45 p. :ill., maps. ;26 cm.,
- Moore, George William; Silver, Eli A., 1968, Gold distribution on the sea floor off the Klamath Mountains, California: [U.S. Geological Survey], Circular 605, iii, 9 p. :maps. ;27 cm.,
- Murray, Charles Richard, 1968, Estimated use of water in the United States, 1965: [U.S. Geological Survey], Circular 556, iv, 53 p. :illus., maps. ;26 cm.,
- Oltman, Roy Edwin, 1968, Reconnaissance investigations of the discharge and water quality of the Amazon River: [U.S. Geological Survey ], Circular 552, iii, 16 p. :illus., maps. ;26 cm.,
- Orem, Hollis M., 1968, Discharge in the lower Columbia River basin, 1928-65: [U.S. Geological Survey], Circular 550, iii, 24 p. :illus., map. ;26 cm.,
- Peterson, D. W.; Yeend, W. E.; Oliver, H. W.; Mattick, R. E., 1968, Tertiary gold-bearing channel gravel in northern Nevada County, California: Circular 566, iii, 22 p. :ill., maps. ;27 cm.,
- Reed, Bruce L.; Elliott, R. L., 1968, Lead, zinc, and silver deposits at Bowser Creek, McGrath A-2 quadrangle, Alaska: [U.S. Geological Survey], Circular 559, iii, 17 p. :illus., maps. ;26 cm.,
- Reed, Bruce L.; Elliott, R. L., 1968, Geochemical anomalies and metalliferous deposits between Windy Fork and Post River, southern Alaska Range: U.S. Dept. of the Interior, Geological Survey, Circular 569, iii, 22 p. :maps ;27 cm.,
- Richter, Donald H.; Matson, Neal A., 1968, Distribution of gold and some base metals in the Slana area, eastern Alaska Range, Alaska: [U.S. Geological Survey], Circular 593, iii, 20 p. :maps. ;27 cm.,
- Rowe, Jack James; Simon, Frederick Otto., 1968, The determination of gold in geologic materials by neutron-activation analysis using fire assay for the radiochemical separations: [U.S. Geological Survey], Circular 599, iii, 4 p. :illus. ;26 cm.,
- Sainsbury, C. L.; Kachadoorain, Reuben; Smith, T. E.; Todd, W. C., 1968, Cassiterite in gold placers at Humboldt Creek, Serpentine-Kougarok area, Seward Peninsula, Alaska: [U.S. Geological Survey], Circular 565, iii, 7 p. :illus., maps. ;27 cm.,
- Schlee, John Stevens, 1968, Sand and gravel on the continental shelf off the northeastern United States: [U.S. Geological Survey], Circular 602, iii, 9 p. :illus., maps. ;26 cm.,
- Sharp, William N.; Gualtieri, James Louis., 1968, Lead, copper, molybdenum, and zinc geochemical anomalies south of the Summitville district, Rio Grande County, Colorado: [U.S. Geological Survey], Circular 557, iii, 7 p. :maps. ;27 cm.,
- Sheridan, Douglas M.; Taylor, Richard B.; Marsh, Sherman P., 1968, Rutile and topaz in Precambrian gneiss, Jefferson and Clear Creek Counties, Colorado: [U.S. Geological Survey], Circular 567, iii, 7 p. :illus., map. ;26 cm.,
- Stewart, John Harris; McKee, Edwin H., 1968, Favorable areas for prospecting adjacent to the Roberts Mountains thrust in southern Lander County, Nevada: [U.S. Govt. Print. Off.], Circular 563, iii, 13 p. :illus., maps. ;26 cm.,
- Theobald, P. K.; Thompson, Charles Emmet., 1968, Platinum and associated elements at the New Rambler mine and vicinity, Albany and Carbon Counties, Wyoming: U.S. Geological Survey, Circular 607, iii, 14 p. :ill., maps. ;27 cm.,
- VanSickle, Gordon H.; Lakin, Hubert William., 1968, An atomic-absorption method for the determination of gold in large samples of geologic materials: [U.S. Govt. Print. Off.], Circular 561, iii, 4 p. ;27 cm.,
- Weld, Betsy A.; Griffin, Margaret S.; Brett, George W., 1968, Reports and maps of the Geological Survey released only in the open files, 1967: U.S. Dept. of the Interior, Geological Survey, Circular 548, 21 p. ;27 cm.,
- Whitebread, Donald Harvey; Hoover, Donald B., 1968, Preliminary results of geological, geochemical, and geophysical studies in part of the Virginia City quadrangle, Nevada: [U.S. Geological Survey], Circular 596, iii, 20 p. :illus., maps. ;26 cm.,
- Wrucke, Chester T.; Armbrustmacher, Theodore J.; Hessin, Thomas D., 1968, Distribution of gold, silver, and other metals near Gold Acres and Tenabo, Lander County, Nevada: [U.S. Geological Survey], Circular 589, iii, 19 p. :maps. ;27 cm.,
