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David S F Portree

The Cow Jumped Over the Moon (1957)

Nov 28, 2012 11:18 PM

The Earliest Candidate Viking Landing Sites (1970)

Nov 22, 2012 11:10 PM

Skylab on the Moon (sort of) (1966)

Nov 15, 2012 6:49 PM

Lunar South Pole-Aitken Sample Return (2002)

Nov 7, 2012 11:14 PM

Making Rocket Fuel on Mars (1978)

Nov 3, 2012 1:29 PM

Around the Moon in 80 Hours (1958)

Oct 29, 2012 10:14 PM

Origin of the Apollo-shaped Manned Mars Lander (1966)

Oct 25, 2012 8:09 PM

Modular Space Station Evolving from Gemini (1962)

Oct 20, 2012 4:35 AM

Measuring Mars: the MESUR Network Mission (1991)

Oct 13, 2012 8:56 PM

My Close Encounter with Atlantis

Oct 12, 2012 8:20 PM

Dyna-Soar's Martian Cousin: Bono's Mars Glider (1960)

Oct 8, 2012 1:20 AM

A 1971 Plan for an Evolutionary Interim Space Station Program

Sep 29, 2012 1:01 PM

The Last Days of the Nuclear Shuttle (1971)

Sep 20, 2012 9:38 PM

Space Suit: 1949

Sep 14, 2012 12:48 AM

Five Options for NASA's (Lunar) Future (1970)

Sep 5, 2012 10:57 PM

The God of Gainful Employment: Project Hyreus (1993)

Sep 4, 2012 1:16 AM

Blue Moon Special: Lunar Oasis (1989)

Aug 31, 2012 1:00 AM

Combining LM Shelter Delivery & Lunar Polar Orbit Mapping (1966)

Aug 28, 2012 1:55 AM

Before the Fire: Saturn-Apollo Applications (1966)

Aug 25, 2012 12:58 AM

Fifty-Man Space Base Crew (1970)

Aug 20, 2012 1:02 PM