TY  - RPRT
TI  - Geologic map of science study area 1B, west Mangala Valles region of Mars
AU  - M. G. Chapman
AU  - Harold Masursky
AU  - A. L. Dial
PY  - 1991
DO  - 10.3133/i2087
UR  - https://pubs.usgs.gov/publication/i2087
ID  - i2087
ER  -