TY  - RPRT
TI  - Reports and maps of the Geological Survey released only in the open files, 1956
AU  - Betsy Anne Weld
AU  - William Stewart Eisenlohr
AU  - Arthur Johnson
PY  - 1957
DO  - 10.3133/cir401
UR  - https://pubs.usgs.gov/publication/cir401
ID  - cir401
ER  -