Books

Infinity Beckoned Infinity Beckoned
2016
Ambassadors from Earth Ambassadors from Earth
2009

Audiobooks

Ambassadors from Earth: Pioneering Explorations with Unmanned Spacecraft: Outward Odyssey: A People's History of Spaceflight (Unabridged) Ambassadors from Earth: Pioneering Explorations with Unmanned Spacecraft: Outward Odyssey: A People's History of Spaceflight (Unabridged)
2020
Infinity Beckoned: Adventuring Through the Inner Solar System, 1969-1989 (Unabridged) Infinity Beckoned: Adventuring Through the Inner Solar System, 1969-1989 (Unabridged)
2017