John Robert Gregg Books

Applied Secretarial Procedures

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A high school textbook introducing the various aspects of a secretarial career including basic job procedures, administrative office systems, and getting a job.

Gregg Shorthand

By John Robert Gregg

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Students Transcript of Gregg Shorthand, Series 90

By J. R. Gregg

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Gregg Speed Building, Series 90

By John Robert Gregg

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Gregg Shorthand Speedbg Ser.90-stud tran

By J.R. Gregg

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Gregg Speed Building Series 90 -wb

By J.R. Gregg

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Key to Workbook for Gregg Speed Building: Series 90

By John Robert Gregg, J.R. Gregg

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Gregg Speed Building: Series 90

By John Robert Gregg

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Gregg shorthand dictionary, series 90

By John Robert Gregg, GREGG

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

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.