Bond, K.R., and Zietz, Isidore, 1987, Composite magnetic anomaly map of the conterminous United States west of 96o longitude: U.S. Geological Survey Geophysical Investigations Map GP-0977, 13 p., 2 sheets, scale 1:2,500,000.
Bond, K.R., and Zietz, Isidore, 1987, Composite magnetic anomaly map of the conterminous United States west of 96o longitude: U.S. Geological Survey Geophysical Investigations Map GP-0977, 13 p., 2 sheets, scale 1:2,500,000.
Magnetic Survey, Geophysical Survey,