Charles Gallenkamp Books

Maya, the riddle and rediscovery of a lost civilization

By Charles Gallenkamp

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Maya

By Charles Gallenkamp

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Dragon Hunter: Roy Chapman Andrews and the Central Asiatic Expeditions

By Charles Gallenkamp

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Maya, the riddle and rediscovery of a lost civilization

By Charles Gallenkamp

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Dragon Hunter

By Charles Gallenkamp

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"The New York Times science editor John Noble Wilford has called it "the most celebrated fossil-hunting expedition of the twentieth century." Led by the world-renowned explorer Roy Chapman Andrews...

Maya, the riddle and rediscovery of a lost civilization

By Charles Gallenkamp

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The mystery of the ancient Maya

By Carolyn Meyer

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Explores the advanced civilization and unsolved mysteries of the Maya who reigned for over 2000 years and then disappeared.

Maya

By Charles Gallenkamp

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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.