Jack Jacobs Books

Rebels against Zion

By August Grabski

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If Not Now, When?

By Jack Jacobs, Douglas Century

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A Medal of Honor recipient looks back at his own service in the Vietnam War—and ahead to America’s future.Jack Jacobs was acting as an advisor to the South Vietnamese when he and his men came unde...

Frankfurt School Jewish Lives and Antisemitism

By Jack Jacobs

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"The history of the Frankfurt School cannot be fully told without examining the relationships of critical theorists to their Jewish family backgrounds. And yet in all three of these eras, Jewish ma...

On Socialists and the Jewish Question after Marx

By Jack Jacobs

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Bundist Counterculture in Interwar Poland

By Jack Jacobs

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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.