1. Inside Commodore DOS: The Complete Guide to the 1541 Disk Operating System
Price: USD 11.69
Dealer: Biblio, Ergodebooks
Description: Brady Publishing. Paperback. Good. Brady Publishing ISBN 0835930912 9780835930918 [US] 

2. Inside Commodore DOS: The Complete Guide to the 1541 Disk Operating System
Price: USD 88.84
Dealer: AbebooksUK, dsmbooks
Description: ISBN10: 0835930912, ISBN13: 9780835930918, [publisher: Prentice Hall PTR] Softcover Very Good [liverpool, United Kingdom] [Publication Year: 1709]