TY  - RPRT
TI  - Surface-water quality, Twin Ponies watershed, Pottawattamie and Mills Counties, Iowa
AU  - Mark G. Detroy
PY  - 1981
DO  - 10.3133/ofr81679
UR  - https://pubs.usgs.gov/publication/ofr81679
ID  - ofr81679
ER  -