TY  - RPRT
TI  - Shaded relief map of US topography from digital elevations
AU  - R.J. Pike
AU  - G.P. Thelin
PY  - 2011
DO  - 10.1029/89eo00291
UR  - https://pubs.usgs.gov/publication/70014939
ID  - 70014939
ER  -