TY  - RPRT
TI  - Preliminary Mars chart, South Polar region, MC-30
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1972
DO  - 10.3133/ofr72418
UR  - https://pubs.usgs.gov/publication/ofr72418
ID  - ofr72418
ER  -