TY  - RPRT
TI  - Reports and maps of the Geological Survey released only in the open files, January through April, 1974
AU  - Betsy A. Weld
AU  - Kathleen T. Iseri
AU  - Gary W. Horton
PY  - 1975
DO  - 10.3133/cir706
UR  - https://pubs.usgs.gov/publication/cir706
ID  - cir706
ER  -