Robert McHenry Books

Critics on Dryden

By Robert W. McHenry

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Documentary History of Conservation in America

By McHenry Robert And Charles Van Doren Editors

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Famous American women

By Robert McHenry

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The biographical profile of over 1000 Ameican women, famous and infamous in hundreds of fields over 400 years. The subjects are arranged alphabetically; indices list names by occupation and importa...

Webster's American Military Biographies

By Robert McHenry

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Famous American Women

By Robert McHenry

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Webster s American Military Biographies

By Robert McHenry

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Encyclopaedia Britannica Set

By Encyclopaedia Britannica Inc.

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The New encyclopaedia Britannica.

By Encyclopaedia Britannica Inc.

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The new encyclopaedia Britannica.

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Encyclopedia Britannica 1998

By Robert McHenry

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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.