The Reference Material captures a wide range of material from throughout Craig's career. The series contains eight sub-series.

Some of the key items include: Report of the Presidential Commission on the Space Shuttle Challenger Accident, and Columbia Accident Investigation Board Report; Post-Apollo Planning of the Space Task Group, September 1969; Apollo 11 Mission Report, prepared by Mission Evaluation Team, NASA Manned Spacecraft Center, 1971; The Vision for Space Exploration, 2004; the book, Mars and Its Mysteries, (Instructor Literature Series) by Latimer J. Wilson, 1917; NASA's Journey to Mars – Pioneering Next Steps in Space Exploration, 2015; and Apollo 15 [Lunar] Descent - Ascent Summary, NASA Mission Support graphic, July 9, 1971. Please refer to the detailed listing to see the full scope of material.