A Traveler's Guide to Mars
ISBN: 0761126066
Buy on Amazon
Found in 1 comment on Hacker News
Florin_Andrei · 2015-09-29 · Original thread
> There's strong speculation that there was an ocean on Mars, many years ago.

Yep. Here's a great book on the topic:

http://www.amazon.com/Travelers-Guide-Mars-William-Hartmann/...

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