Harold Frederic Books

The Westsylvania pioneers, 1774-1776

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THE WESTSYLVANIA PIONEERS 1774-1776. 1991 (2005 Reprint) by Harold Frederic & William C. Frederick III. The authors describe how Western Pennsylvania almost became a separate state called Westsylva...

Gloria Mundi

By Harold Frederic

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The Market Place

By Harold Frederic

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The Damnation of Theron Ware

By Harold Frederic

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Damnation of Theron Ware

By Harold Federic

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Market Place

By Harold Frederic

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In the Valley

By Harold Frederic

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March Hares

By Harold Harold Frederic

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Damnation of Theron Ware

By Harold Harold Frederic

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Lawton Girl

By Harold Harold Frederic

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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.