TY  - RPRT
TI  - Preliminary maps and reports released by the Geologic Division, 1946-47, and by the Conservation Division, 1938-47
AU  - Ruth A. Atherton
AU  - W.H. Eckstein
AU  - R.E. Spratt
PY  - 1949
DO  - 10.3133/cir56
UR  - https://pubs.usgs.gov/publication/cir56
ID  - cir56
ER  -