TY  - RPRT
TI  - No read -- no write
AU  - Ralph Hile
PY  - 1971
DO  - 10.1577/1548-8659(1971)100<394:cwospd>2.0.co;2
UR  - https://pubs.usgs.gov/publication/1000227
ID  - 1000227
ER  -