TY  - RPRT
TI  - Digital files of geologic map symbols with cartographic specifications
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1995
DO  - 10.3133/ofr95526
UR  - https://pubs.usgs.gov/publication/ofr95526
ID  - ofr95526
ER  -