1961
Bibliografía (19 obras)
The new cosmos
2015
Comets!
2013
Dixie betrayed
2006
Cosmos
Gettysburg Battlefield
2003
The longest night
2001
Mystic chords of memory
1998
Robert E. Lee
1997
The Civil War in books
1996
Civil War Journeys
Civil War battlefields
1995
Beginner's guide to amateur astronomy
1993
Galaxies and the universe
1992
Beyond the solar system
Stars and galaxies
Stars and Galaxies
Galaxies and the Universe
Deep-sky observing with small telescopes
1989
The universe from your backyard
1988
