Harvey Klehr Books

In Denial

By Harvey Klehr, John Earl Haynes

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The Amerasia Spy Case: Prelude to McCarthyism

By Ronald Radosh, Harvey Klehr

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The Amerasia affair was the first of the great spy cases of the postwar era. Unlike the Hiss or Rosenberg case, it did not lead to an epic courtroom confrontation or the imprisonment or execution o...

Amerasia Spy Case

By Ronald Radosh, Harvey Klehr

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The American communist movement

By Harvey Klehr

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Communist Experience in America

By Harvey Klehr

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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.