1. Comparing and Merging Files With Gnu Diff and Patch
by Mackenzie, David 
Price: USD 34.27
Dealer: Alibris, Book Forest via Alibris
Description: Network Theory. 2003 Trade paperback New Well packaged and promptly shipped from California. US veteran operated. 

2. Comparing and Merging Files with GNU diff and patch
by MacKenzie David 
Price: USD 34.27
Dealer: Biblio, The Book Forest
Description: New. Well packaged and promptly shipped from California. US veteran operated. ISBN 0954161750 9780954161750 [US] 

3. Comparing and Merging Files with GNU diff and patch
by MacKenzie, David; Eggert, Paul; Stallman, Richard 
Price: USD 34.27
Dealer: Abebooks, thebookforest.com
Description: ISBN10: 0954161750, ISBN13: 9780954161750, [publisher: Network Theory Ltd] Softcover Well packaged and promptly shipped from California. US veteran operated. [San Rafael, CA, U.S.A.] [Publication Year: 2003]