- Zietz, Isidore; Gilbert, F. P., 1980, Aeromagnetic map of the southeastern United States in color: Geophysical Investigation Map 936, 1 map :col. ;56 x 63 cm.,
- Zietz, Isidore; Gilbert, F. P., 1980, Aeromagnetic map of part of the southeastern United States: Geophysical Investigation Map 937, -,
- Zietz, Isidore; Gilbert, F. P.; Kirby, J. R., Jr., 1980, Aeromagnetic map of Delaware, Maryland, Pennsylvania, West Virginia, and parts of New Jersey and New York: Geophysical Investigation Map 927, 1 map :col. ;on sheet 68 x 90 cm.,
- Zietz, Isidore; Gilbert, F. P.; Snyder, S. L., 1980, Aeromagnetic map of Montana in color: Geophysical Investigation Map 934, 1 map :col. ;on sheet 67 x 99 cm. folded in envelope 30 x 24 cm.,
- Zietz, Isidore; Gilbert, Francis P.; Kirby, John R., Jr., 1980, Aeromagnetic map of Connecticut, Massachusetts, New Hampshire, Rhode Island, Vermont, and part of New York: Geophysical Investigation Map 928, 1 map :col. ;on sheet 74 x 60 cm.,
- Zietz, Isidore; Gilbert, Francis P.; Snyder, Stephen L., 1980, Aeromagnetic map of Montana: Geophysical Investigation Map 935, -,
- Zietz, Isidore; Riggle, F. E.; Gilbert, F. P., 1980, Aeromagnetic map of Georgia: Geophysical Investigation Map 940, 1 map ;108 x 93 cm.,
- Zietz, Isidore; Riggle, F. E.; Gilbert, F. P., 1980, Aeromagnetic map of Georgia in color: Geophysical Investigation Map 941, 1 map :col. ;54 x 46 cm.,
