TY  - RPRT
TI  - Discover the many types of maps available from the U.S. Geological Survey
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1999
DO  - 10.3133/70039191
UR  - https://pubs.usgs.gov/publication/70039191
ID  - 70039191
ER  -