TY  - RPRT
TI  - Public review draft: digital cartographic standard for geologic map symbolization (Postscript implementation)
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1999
DO  - 10.3133/ofr99430
UR  - https://pubs.usgs.gov/publication/ofr99430
ID  - ofr99430
ER  -