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David S F Portree

Science

Shuttle-Era Manned Mars Flyby (1985)

Jun 17, 2012 2:48 AM

Science

Mercury Space Observatory (1964)

Jun 16, 2012 12:54 AM

Science

Lunar Base or Space Station? (1983)

Jun 14, 2012 10:00 AM

Science

Harold Urey's Lunar Landing Sites (1961)

Jun 13, 2012 12:11 AM

Science

Apollo Lunar Orbit Rescue (1965)

Jun 10, 2012 11:15 AM

Science

Evolution vs. Revolution: The 1970s Battle for NASA's Future

Jun 8, 2012 2:09 AM

Science

McDonnell Douglas Phase B 12-Man Space Station (1970)

Jun 6, 2012 12:06 AM

Science

2012 Venus Transit Special #3: Robot Probes for Piloted Venus Flybys (1967)

Jun 2, 2012 3:58 AM

Science

2012 Venus Transit Special #2: Humans in Venus Orbit (1967)

Jun 1, 2012 12:49 AM

Science

2012 Venus Transit Special #1: Piloted Single-Launch Venus Flyby (1967)

May 31, 2012 12:50 AM

Science

Lunar Accident Site Investigation (1967)

May 29, 2012 1:07 AM

Science

The First Voyager (1967)

May 27, 2012 12:11 AM

Science

Marooned in Lunar Orbit (1968)

May 25, 2012 12:28 AM

Science

Collins Task Force Says Aim for Mars (1987)

May 23, 2012 9:46 AM

Science

New Horizons II (2004-2005)

May 22, 2012 12:05 AM

Science

Piloted Split/Sprint Mission to Mars (1987)

May 19, 2012 2:02 AM

Science

The Eagle Has Crashed (1966)

May 15, 2012 7:22 PM

Science

Apollo-Soyuz Shuttle Manipulator Demo (1971-1972)

May 14, 2012 1:29 AM

Science

Galileo-style Uranus Tour (2003)

May 12, 2012 1:23 AM

Science

Shuttle With Aft Cargo Carrier (1982)

May 11, 2012 12:25 AM