TY  - BOOK
AU  - Sagan, Carl
AU  - Pollack, James B.
TI  - Elevation differences on Mars: by... and James B. Pollack
AV  - TL796 A1 S6 no. 224 
PY  - 1966///
CY  - Cambridge, Mass.
PB  - Smithsonian Institution
KW  - Mars (Planet)
ER  -