Marc Hartzman Books

American Sideshow

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A fascinating look into the history of the American sideshow and its performers. Learn what's real, what's fake, and what's just downright bizarre. You've probably heard of Tom Thumb. The Elephant...

The Big Book of Mars

By Marc Hartzman

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The most comprehensive look at our relationship with Mars—yesterday, today, and tomorrow—through history, archival images, pop culture ephemera, and interviews with NASA scientists,&#16...

Chasing Ghosts

By Marc Hartzman

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“A fantastic book.”—Ben Kissel, co-host of Last Podcast on the LeftTake a spirited tour through the supernatural history of America, from its haunted sites to its famous ghosts to...

We Are Not Alone

By Marc Hartzman

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“We Are Not Alone . . . manages to be highly entertaining and easy to read, yet fair, balanced and thorough.”—Christopher Mellon, former Deputy Assistant Secretary of Defense for...

Scrapbook of Agnes Schwarzenbacher the Rubber Skin Lady

By Marc Hartzman, Dori Bischmann, Jim Bischmann

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Scrapbook of Agnes Schwarzenbacher the Rubber Skin Lady

By Marc Hartzman, Dori Bischmann, Jim Bischmann

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Book of Wonderful Characters

By Henry Wilson, James Caulfield, Marc Hartzman

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The Big Book of Mars

By Marc Hartzman

Average: 0.00, 0 Ratings

The most comprehensive look at our relationship with Mars—yesterday, today, and tomorrow—through history, archival images, pop culture ephemera, and interviews with NASA scientists,&#16...

Chasing Ghosts

By Marc Hartzman

Average: 0.00, 0 Ratings

“A fantastic book.”—Ben Kissel, co-host of Last Podcast on the Left Take a spirited tour through the supernatural history of America—from haunted sites and famous ghost...

We Are Not Alone

By Marc Hartzman

Average: 0.00, 0 Ratings

“We Are Not Alone . . . manages to be highly entertaining and easy to read, yet fair, balanced and thorough.”—Christopher Mellon, former Deputy Assistant Secretary of Defense for...

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.