Proceedings of the Foundation Convention of the Mars Society: Part 1 by Robert M. Zubrin and Maggie Zubrin (Jul 1999)
From Imagination to Reality, Base Building, Colonization and Terraformation: Mars Exploration Studies of the Journal... by Robert M. Zubrin, American Astronautical Society and British Interplanetary Society (Jul 1997)
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The Case for Mars: The Plan to Settle the Red Planet and Why We Must by Robert Zubrin and Richard Wagner (Jun 28, 2011)