The other and probably the best reason that force the end of John F. Rider, Publisher Inc, was that Howard W. Sams Publishing or SAMS Publishing of Indianapolis, IN developed and copyrighted the PhotofactTM service folder that had all the things that Rider provided but added large photographs to identify the parts along with much better written servicing instructions.
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Furthermore SAMS Publishing released service notes by folder number (containing specific makes and models) not large bound volumes, making it easier to purchase servicing information.
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Northrup has published 32 how-to books covering Windows systems administration, software development, and photography for Microsoft Press, O'Reilly, SAMS Publishing, and Mason Press.