Daniel E. Harmon Books

Explores the truth and misconceptions regarding anorexia nervosa by examining its history, causes, considerations, treatment, and related eating disorders.

Nigeria 1880 To the Present The Struggle the Tragedy the Promise Exploration of Africa the Emerging Nations

By Daniel E. Harmon

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Photographs and text look at the past, development, and present culture of Nigeria and its inhabitants.

Sudan 1880 To the Present Crossroads of a Continent in Conflict The Exploration of Africa the Emerging Nations

By Daniel E. Harmon

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Juan Ponce de Leon and the search for the Fountain of Youth

By Daniel E. Harmon

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A biography of the Spanish explorer and governor of Cuba, who attempted to find the Fountain of Youth in the New World.

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.