TY  - RPRT
TI  - Preliminary geologic terrain map of Mars
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
AU  - Baerbel K. Lucchitta
PY  - 1972
DO  - 10.3133/ofr72416
UR  - https://pubs.usgs.gov/publication/ofr72416
ID  - ofr72416
ER  -