TY  - RPRT
TI  - Reports and maps of the Geological Survey released only in the open files, 1971
AU  - Betsy A. Weld
AU  - Kathleen T. Iseri
AU  - George W. Brett
PY  - 1972
DO  - 10.3133/cir648
UR  - https://pubs.usgs.gov/publication/cir648
ID  - cir648
ER  -