John Heilborn Books

UNIX Complete
UNIX Complete

By Peter Dyson, Stan Kelly Bootle, John Heilborn

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"With Unix Complete, you'll learn how to get the most out of UNIX System V - from building file systems, to connecting to remote computers and the Internet, to using mainstream programs."--BOOK JAC...

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VIC 20 user guide
VIC 20 user guide

By John Heilborn

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Compute!'s reference guide to Commodore 64 graphics
Compute!'s beginner's guide to Commodore 64 sound
Illustrated Windows 3.1 Illustrated Computer Skills
Windows 3.0 illustrated quick tutorial
Printer troubleshooting & repair
Commodore 128
Commodore 128

By John Heilborn

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Your Commodore 64
Your Commodore 64

By John Heilborn

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Science and Engineering Programs

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If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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