TY  - RPRT
TI  - User documentation for North Dakota geochemical data-base software system; input, update, and retrieval procedures
AU  - John W. Atwood
PY  - 1993
DO  - 10.3133/ofr93117
UR  - https://pubs.usgs.gov/publication/ofr93117
ID  - ofr93117
ER  -