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David S F Portree

NASA's Mars Design Reference Mission Goes Nuclear (2001)

Jan 18, 2014 1:18 PM

To Mars by Flyby-Landing Excursion Mode (FLEM) (1966)

Jan 12, 2014 2:14 PM

Rosen & Schwenk's Moon Mission (1959)

Jan 4, 2014 12:58 PM

Rinehart's Floating Moonbase (1959)

Jan 1, 2014 12:47 PM

Martian Weight Problem: Mars Sample Return Version 0.7 (1998)

Dec 11, 2013 10:50 PM

Linking Space Station & Mars: the IMUSE Strategy (1985)

Dec 5, 2013 11:25 PM

Moonbase Apollo (1968)

Nov 29, 2013 4:19 PM

Robot Rendezvous in Mars Orbit (1999)

Nov 20, 2013 11:57 PM

Encke in 1980! (1974)

Nov 12, 2013 11:32 PM

Mission to a Mare Ridge (1968)

Nov 7, 2013 11:59 PM

Shoestring Bug, Economy Bug, Plush Bug (1961)

Oct 26, 2013 1:00 AM

Beyond Apollo Posts on Robotic Exploration Planning

Oct 20, 2013 2:53 AM

Mars Polar Ice Sample Return (1976-1978)

Oct 10, 2013 8:36 PM

Spraying Bugs on Mars (1964)

Oct 2, 2013 2:16 PM

Ending Apollo (1968)

Sep 22, 2013 2:33 PM

A Forgotten Rocket: The Saturn IB

Sep 16, 2013 2:16 AM

A Stronger, Safer, Better Space Shuttle (1982)

Sep 9, 2013 1:26 AM

Project Olympus (1962)

Sep 2, 2013 3:37 PM

Mars Sample Return: Vive le retour des-chantillons martiens! (1999)

Aug 18, 2013 3:40 AM

The Quest to Explore the Moon from Lunar Orbit (1967)

Aug 10, 2013 1:52 AM