TY  - RPRT
TI  - Reports and maps of the Geological Survey released only in the open files, 1949-1950
AU  - Anna Jesperson
AU  - Lois E. Randall
AU  - Robert E. Spratt
PY  - 1952
DO  - 10.3133/cir149
UR  - https://pubs.usgs.gov/publication/cir149
ID  - cir149
ER  -