Jeff Karl Kowalski Books

Mesoamerican Architecture as a Cultural Symbol

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"This book considers the ways in which the built environment in Mesoamerica functioned as a carrier of cultural meanings. Ancient Mesoamerica - making up much of present-day Mexico, Guatemala, and...

The House of the Governor

By Jeff Karl Kowalski

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Twin Tollans

By Dan Healan, Peter Schmidt, David A. Freidel, Patricia Fournier, Jeffrey Quilter, Geoffrey McCafferty, William Ringle, George J. Bey, Nikolai Grube, Susan Gillespie, Ruth Krochock, Mary Miller, Rafael Cobos, Victor H. Bolanos, Susan Kepecs

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Twin Tollans

By Jeff Karl Kowalski

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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.