Gerald J. Prokopowicz Books

The Lincoln Enigma: The Changing Faces of an American Icon

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Nearly a century and a half after his death, Abraham Lincoln remains an intrinsic part of the American consciousness, yet his intentions as president and his personal character continue to stir deb...

Did Lincoln Own Slaves?

By Gerald J. Prokopowicz

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In the bicentennial year of Lincoln's birth, here is the one indispensable book that provides all you need to know about our most revered president in a lively and memorable question-and-answer for...

Did Lincoln Own Slaves

By Gerald J. Prokopowicz

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American Eras

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All for the Regiment

By Gerald J. Prokopowicz

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The living Lincoln

By Harold Holzer, Williams Frank J., Thomas A. Horrocks

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Did Lincoln Own Slaves

By Norman Dietz, Gerald J. Prokopowicz

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Did Lincoln Own Slaves

By Norman Dietz, Gerald J. Prokopowicz

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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.