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Callahan's Key Author: Spider Robinson Hardcover 7/5/2000 Bantam Books : Spectra ISBN10 : 0553111639 ISBN13 : 9780553111637 Callahan's Key Author: Spider Robinson Paperback (Mass Market Paperback) 5/1/2001 Bantam Dell ISBN13 : 9780553580600 Callahan's Key Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (Audio Cassette) 9/1/2003 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786125517 Callahan's Key Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (CD MP3) 9/1/2003 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786188703 Callahan's Key Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (Compact Disc) 9/1/2003 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786191284