TY  - RPRT
TI  - A guide to obtaining information from the USGS 1978
AU  - Paul F. Clarke
AU  - Helen E. Hodgson
AU  - Gary W. North
PY  - 1978
DO  - 10.3133/cir777
UR  - https://pubs.usgs.gov/publication/cir777
ID  - cir777
ER  -