TY  - RPRT
TI  - Digital line graphs from 1:100,000-scale maps
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1989
DO  - 10.3133/70046345
UR  - https://pubs.usgs.gov/publication/70046345
ID  - 70046345
ER  -