Charles H Hapgood Books

Eaths Shifting Crusta Key to Some Basic Problems of Earth Science

By Charles H Hapgood

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Voices of spirit: Through the psychic experience of Elwood Babbitt

By Charles H. Hapgood

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The path of the pole

By Charles H. Hapgood

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Revised edition of "Earth's shifting crust" published in 1958. Theory of polar wandering based on variations in glacierization of polar areas. From radio carbon datings of climatic events of the la...

Maps of the ancient sea kings

By Charles H. Hapgood

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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.