Paul C. Nagel Books

One nation indivisible

By Paul C. Nagel

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This sacred trust, American nationality, 1798-1898

By Paul C. Nagel

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This Sacred Trust: American Nationality 1798-1898: American Nationality 1778-1898

By Paul C. Nagel

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Descent from glory

By Paul C. Nagel

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Family history of John Adams (1735-1826), second president of the United States, and of his wife, Abigail Smith, and of their descendants to the fourth generation--using family letters and diaries...

Descent from Glory

By Paul C. Nagel

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The Adams Women: Abigail and Louisa Adams, Their Sisters and Daughters

By Paul C. Nagel

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The Lees of Virginia

By Paul C. Nagel

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The Adams Women

By Paul C. Nagel

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The Lees of Virginia: Seven Generations of an American Family

By Paul C. Nagel

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The Lees of Virginia: Seven Generations of an American Family

By Paul C. Nagel

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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.