Reports and maps of the Geological Survey released only in the open files, January through April, 1974
- by Betsy A. Weld, Kathleen T. Iseri, and Gary W. Horton.
- Reston Va. : U.S. Dept. of the Interior, Geological Survey, 1975.
- Physical description
- 10 pages ; 26 cm.
- Geological Survey circular 706.