TY  - RPRT
TI  - Topographic map of the Palisades-Unkar area, Grand Canyon, Arizona
AU  - Ivo Lucchitta
PY  - 1991
DO  - 10.3133/ofr91636
UR  - https://pubs.usgs.gov/publication/ofr91636
ID  - ofr91636
ER  -