TY  - RPRT
TI  - Index to water-quality data available from the U.S. Geological Survey in machine-readable form to December 31, 1972: Western region
AU  - Charles R. Showen
AU  - Owen O. Williams
PY  - 1973
DO  - 10.3133/wri7324
UR  - https://pubs.usgs.gov/publication/wri7324
ID  - wri7324
ER  -