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United States (regional); United States (1978)
Official, Map sheet or poster
Preliminary Overview Map of Volcanic Hazards in the 48 Coterminous United States
Mullineaux, D.R. (1978). Preliminary overview map of volcanic hazards in the 48 conterminous United States. U.S. Geological Survey, Miscellaneous Field Studies Map 786. https://doi.org/10.3133/mf786