- Cady, J. W.; Meyer, R. F., 1976, Bouguer gravity map of the Okanogan, Sandpoint, Ritzville, and Spokane 1 degree by 2 degrees quadrangles, northeastern Washington and northern Idaho: Geophysical Investigation Map 914, 1 map ;89 x 121 cm., folded in envelope 30 x 23 cm.,
- Geological Survey (U.S.), 1976, Aeromagnetic map of Iowa: Geophysical Investigation Map 910, 1 map ;72 x 109 cm., folded in envelope 30 x 24 cm.,
- Harwood, D. S.; Zietz, Isidore, 1976, Geologic interpretation of aeromagnetic map of southern New England: Geophysical Investigation Map 906, 1 map :col. ;88 x 136 cm., folded in envelope 30 x 23 cm.,
- Healey, D. L.; Kibler, J. D., 1976, Complete Bouguer and free-air gravity anomaly maps of the Delarof Islands and Tanaga Island, Alaska: Geophysical Investigation Map 908, 2 maps on 1 sheet ;each 33 x 55 cm., sheet 86 x 73 cm., folded in envelope 30 x 23 cm.,
- Healey, D. L.; Kibler, J. D., 1976, Complete Bouguer and free-air gravity anomaly maps of the Rat Islands west of Amchitka Island, Alaska: Geophysical Investigation Map 909, 2 maps on 1 sheet ;33 x 55 cm., on sheet 86 x 73 cm., folded in envelope 30 x 23 cm.,
- Krivoy, H. L.; Eppert, H. C., Jr.; Pyle, T. E., 1976, Simple Bouguer gravity anomaly map of the Gulf of Mexico and adjacent land areas: Geophysical Investigation Map 912, map ;69 x 93 cm.,
- Zietz, Isidore; Gilbert, F. P.; Kirby, J. R., Jr., 1976, Aeromagnetic map of Iowa color coded intensities: Geophysical Investigation Map 911, 1 map :col. ;37 x 55 cm.,
- Zietz, Isidore; Shuey, Ralph; Kirby, J. R., Jr., 1976, Aeromagnetic map of Utah: Geophysical Investigation Map 907, 1 map :col. ;57 x 46 cm., on sheet 69 x 66 cm., folded in envelope 30 x 24 cm.,
