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Mars Direct: A plan for a manned Mars mission created by NASA engineers Robert Zubrin and David Baker in 1990, later expanded upon in Zubrin's 1996 book The Case for Mars.
The book is also notable for including a publication of Robert Zubrin's Mars Direct mission architecture (first formulated in 1990), which was soon expanded into a book of its own, The Case For Mars: The Plan to Settle the Red Planet and Why We Must, and which provided the impetus for the founding of the Mars Society.