TY  - RPRT
TI  - Research, Investigations and Technical Developments, National Mapping Program
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1983
DO  - 10.3133/ofr83568
UR  - https://pubs.usgs.gov/publication/ofr83568
ID  - ofr83568
ER  -