TY  - RPRT
TI  - Research, investigations, and technical developments, National Mapping Program, 1981
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1981
DO  - 10.3133/ofr82236
UR  - https://pubs.usgs.gov/publication/ofr82236
ID  - ofr82236
ER  -