Marc Wortman Books

The Millionaire's Unit: The Aristocratic Flyboys Who Fought the Great War and Invented America's Air Might

By Marc Wortman

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Poker Night

By Marc Wortman, Joel Krass

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Describes how Franklin D. Roosevelt quietly used his power and all the tools he had to assist Winston Churchill in fighting the Axis long before the United States' official entry into World War II....

1941 Fighting the Shadow War

By Marc Wortman

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x, 409 pages : 21 cm

The Millionaires Unit

By Marc Wortman

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The Millionaires Unit

By Marc Wortman

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The Millionaires Unit

By Marc Wortman

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The Millionaires Unit

By Marc Wortman

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1941

By Marc Wortman, Richard Poe

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The Millionaire s Unit

By Marc Wortman

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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.