Bulletins. 1260-1, J. Summary report on geology and mineral resources of: Huron, Seney, Michigan Islands, Green Bay, and Gravel Island National Wildlife Refuges of Mich, and Wis. [with list of references cited], by Carl E. Dutton; Charons Garden unit, Wichita Mountain, National Wildlife Refuge, Comanche County, Okla. [with list of references cited], by Edward L. Johnson.