| Title: | Humans to Mars: Fifty Years of Mission Planning, 1950-2000 |
| Author: | Portree, David S. F. |
| Note: | Washington: National Aeronautics and Space Administration, 2001 |
| Link: | PDF at NASA |
| Link: | page images at HathiTrust |
| Stable link here: | https://onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp63643 |
| Subject: | Space flight to Mars -- Planning |
| Subject: | United States. National Aeronautics and Space Administration |
| Call number: | TL799 .M3 P67 2000 |
| Other copies: | Look for editions of this book at your library, or elsewhere. |
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