Stranger in a Strange Land by Robert A. Heinlein
My rating: 4 of 5 stars
I recently reread this and still really enjoyed it. The plot is well-worn but the details of the story are fun. Though many of the characters are somewhat flat I really enjoyed the father-figure character, Jubal Harshaw.
Also, here's a link on the flags of Mars: https://en.wikipedia.org/wiki/Flag_of_Mars.
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