- Brabb, E. E.; Hann, W. F., 1981, Maps showing aeromagnetic anomalies, faults, earthquake epicenters, and igneous rocks in the southern San Francisco Bay region, California: Geophysical Investigation Map 932, 3 maps :col. ;88 x 106 cm. +1 text (6 p. ; 28 cm.),
- Cannon, W. F.; Fenichel, A. E., 1981, Aeromagnetic map of the eastern part of the Northern Peninsula of Michigan: Geophysical Investigation Map 947, 1 map :col. ;68 x 107 cm.,
- Childs, J. R.; Cooper, A. K.; Wright, A. W., 1981, Residual magnetic map of Umnak Plateau region, southeastern Bering Sea: Geophysical Investigation Map 939, 1 map :col. ;67 x 83 cm.,
- Diment, W. H.; Urban, T. C., 1981, Average elevation map of the conterminous United States (Gilluly averaging method): Geophysical Investigation Map 933, 1 map ;on 2 sheets 135 x 104 cm.,
- Godson, R. H.; Zablocki, C. J.; Pierce, H. A.; Frayser, J. B.; Mitchell, C. M.; Sneddon, R. A., 1981, Aeromagnetic map of the Island of Hawaii: Geophysical Investigation Map 946, 1 map :col. ;64 x 54 cm.,
- Hendricks, J. D.; Keller, G. R.; Hildenbrand, T. G., 1981, Bouguer gravity map of Arkansas: Geophysical Investigation Map 944, 1 map ;80 x 92 cm.,
- Hildenbrand, T. G.; Kucks, R. P.; Johnson, R. W., Jr., 1981, Aeromagnetic map of east-central United States: Geophysical Investigation Map 948, 1 map :col. ;98 x 142 cm.,
- Zietz, Isidore; Gilbert, F. P., 1981, Aeromagnetic map of New York: Geophysical Investigation Map 938, 1 map ;201 x 228 cm. on 5 sheets.,
- Zietz, Isidore; Gilbert, F. P., 1981, Aeromagnetic map of the northeastern United States in color: Geophysical Investigation Map 942, 1 map :col. ;71 x 68 cm.,
- Zietz, Isidore; Gilbert, F. P., 1981, Aeromagnetic map of the northeastern United States: Geophysical Investigation Map 943, 1 map ;72 x 68 cm.,
