Colossus
Published by Berkley Pub Group
Publication date: March 1985
ISBN: 0425076482

The Fall of Colossus
Published by Putnam Pub Group
Publication date: March 1974
ISBN: 0399112820

Colossus and the Crab
Published by Berkley Pub Group
Publication date: June 1980
ISBN: 0425043274

Colossus Trilogy : A Twenty Fifth Anniversary Omnibus Edition/ Colossus, Fall of Colossus and Colossus and the Crab
Published by Image Pub of New York
Publication date: May 1992
ISBN: 9991250271