TY  - RPRT
TI  - The National Map: Topographic Maps for the 21st Century
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 2001
DO  - 10.3133/fs10101
UR  - https://pubs.usgs.gov/publication/fs10101
ID  - fs10101
ER  -