Heck, N.H., 1938, Earthquakes and the western mountain region: Geological Society of America Bulletin, v. 49, no. 1, p. 1-21. Authors Heck, N.H. Publication Date 1938 Citation Geological Society of America Bulletin, v. 49, no. 1, p. 1-21. State AZ Province BR CP TR County YU CN MO Placenames Yuma area San Francisco Volcanic Field Williams area Keywords Seismology Earthquake More Keywords Seismology, Earthquake, AzGeoBib RefNum 4272