TY  - RPRT
TI  - Dark material in the polar layered deposits and dunes on Mars
AU  - Kenneth E. Herkenhoff
AU  - Ashwin R. Vasavada
PY  - 1999
DO  - 10.1029/1998je000589
UR  - https://pubs.usgs.gov/publication/70021536
ID  - 70021536
ER  -