- Bodhaine, G. L., 1968, Measurement of peak discharge at culverts by indirect methods: U.S. Govt. Print. Off., Techniques of Water-Resource Investigation 03-A3, viii, 60 p. :ill. ;27 cm. Reprinted 1982, 1989.,
- Buchanan, Thomas J.; Somers, William P., 1968, Stage measurement at gaging stations: U. S. Govt. Print. Off. : for sale by the Branch of Distribution, U. S. Geological Survey, Techniques of Water-Resource Investigation 03-A7, vi, 28 p. :ill. ;26 cm.,
- Carter, R. W.; Davidian, Jacob, 1968, General procedure for gaging streams: U. S. Govt. Print. Off. : for sale by the Branch of Distribution, U. S. Geological Survey, Techniques of Water-Resource Investigation 03-A6, v, 13 p. :ill. ;26 cm.,
- Dalrymple, Tate; Benson, M. A., 1968, Measurement of peak discharge by the slope-area method: Department of the Interior :for sale by the Supt. of Docs., U. S. Govt. Print. Off., Techniques of Water-Resource Investigation 03-A2, v, 12 p. :ill. ; 26 cm. Reprinted in 1984, 1989.,
- Garber, M. S.; Koopman, F. C., 1968, Methods of measuring water levels in deep wells: U.S. Govt. Print. Off., Techniques of Water-Resource Investigation 08-A1, iv, 23 p. :ill. ;26 cm. Reprinted in 1979.,
- Jenkins, C. T., 1968, Computation of rate and volume of stream depletion by wells: U.S. Dept. of the Interior, Geological Survey :For sale by the Supt. of Docs., U.S. G.P.O., Techniques of Water-Resource Investigation 04-D1, v, 17 p. :ill. ;26 cm. Reprinted in 1977.,
- Matthai, Howard Frederick; Stull, Harold E.; Davidian, Jacob, 1968, Preparation of input data for automatic computation of stage-discharge relations at culverts: [U.S.G.S.?, Techniques of Water-Resource Investigation 07-C3, vi, 25 p. :ill. ;27 cm.,
- Riggs, H. C., 1968, Some statistical tools in hydrology: U.S. Govt. Print. Off., Techniques of Water-Resource Investigation 04-A1, vi, 39 p. :ill. ;26 cm. Reprinted in 1977.,
- Riggs, H. C., 1968, Frequency curves: U.S. Govt. Print. Off., Techniques of Water-Resource Investigation 04-A2, v, 15 p. :ill. ;26 cm. Reprinted in 1978, 1989.,
- Smoot, George F.; Novak, Charles E., 1968, Calibration and maintenance of vertical-axis type current meters: U. S. Govt. Print. Off., (for sale by Branch of Distribution, U. S. Geological Survey, Arlington, Va.), Techniques of Water-Resource Investigation 08-B2, vi, 15 p. :ill. ;26 cm. Reprinted in 1977.,
- Wilson, James F., 1968, Fluorometric procedures for dye tracing: U.S.G.P.O., Techniques of Water-Resource Investigation 03-A12, vii, 31 p. :ill. ;26 cm.,
