TY  - RPRT
TI  - Slope maps: a new USGS product
AU  - C.R. Gilman
AU  - F.S. Brownworth
AU  - C.W. Richter
PY  - 1975
DO  - 10.3133/1677
UR  - https://pubs.usgs.gov/publication/1677
ID  - 1677
ER  -