1) RM, author of Arctic Village, 1901-1939, usually 'Bob Marshall', w as a US environmentalist and philanthropist. The Bob Marshall Wilderness in Montana is named in his honor as is Mount Marshall in the Adirondack Mountains of New York. He was one of the first three Adirondack Forty Sixers.
2) RM, author of A Separate Reality, is "an author and visual artist living in New York".
3) RM, author of Storm from the East, b.1952.
4) Captain RM, Scottish playwright, author of The Haunted Major, 1863-1910.
5) RM, author of K2: Lies and Treachery, is an Australian surgeon, supporter and translator of Walter Bonatti who was on the first expedition to climb K2.
6) RM, author of Living Anatomy, is an Australian surgeon, b.1926. He may be the same as RM #5
7) RM, author of Physical Science is Robert H Marshall who has his own author page.
8) Robert Marshall - Diana
9) Robert Marshall, Australia - Shadow Makers
10) RM, Australia - Hear the Siren
11) RM, American artist in watercolor and oil, and BYU professor