1
by Harland, David M., Harvey, Brian
Published 2008
Praxis
Table of Contents: ... Exploration... -- NASA’s New Robotic Lunar Program... -- And When We’re Back on the Moon, What Next...

2
by Harland, David M.
Published 2011
Praxis
... to completion; includes conversations among the crew in the spacecraft that were not transmitted...

3
by Harland, David M.
Published 2005
Praxis

4
by Harland, David M., Lorenz, Ralph
Published 2005
Praxis
...In the 1960s and 1970s deep space missions were dispatched in pairs in case one was lost in launch...