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Callahan's Con Author: Spider Robinson Hardcover 8/2/2003 Tom Doherty Associates : Tor Books ISBN10 : 0765302705 ISBN13 : 9780765302700 Callahan's Con Author: Spider Robinson Paperback 6/14/2004 Tom Doherty Associates : Tor Books ISBN10 : 0765341654 ISBN13 : 9780765341655 Callahan's Con Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (Audio Cassette) 10/1/2004 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786128136 Callahan's Con Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (Compact Disc) 10/1/2004 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786183470 Callahan's Con Author: Spider Robinson Read by: Barrett Whitener DVD-CD-Tape (CD MP3) 10/1/2004 BLACKSTONE AUDIO BOOKS ISBN13 : 9780786184538