1. Bouguer Gravity Anomaly Map of the United States (Exclusive of Alaska and Hawaii) 1964
2. U.S. Geol. Surv. Misc. Geol. Invest. Map 1972 I-711
3. Tectonic Map of the United States. Exclusive of Alaska and Hawaii 1961
4. U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 1973 73-304 Aeromagnetic map of Yellowstone National Park and vicinity Wyoming-Montana-Idaho
5. ARMSTRONG, R.L., K-AR DATING, QUATERNARY AND NEOGENE VOLCANIC-ROCKS OF SNAKE RIVER PLAIN, IDAHO, AMERICAN JOURNAL OF SCIENCE 275: 225 (1975).