• ENCYCLOPEDIA OF SCIENCE



• ENCYCLOPEDIA OF ALTERNATIVE ENERGY AND SUSTAINABLE LIVING



• CHILDREN'S ENCYCLOPEDIA OF ASTRONOMY

Complete Book of Mathematics (2004)

Complete Book of Spaceflight (2002)

Deep Time (1989)

Equations of Eternity (1993)

Extraterrestrial Encyclopedia (1999)

Gravity's Arc: The Story of Gravity from Aristotle to Einstein and Beyond (2006)

Life Everywhere: The Maverick Science of Astrobiology (2001)

Soul Search (1995)

Teleportation: The Impossible Leap (2005)

Universal Book of Astronomy (2003)

Zen Physics (1996)

other