Gerald E. Payo Books

Tejano Origins In Eighteenth-Century San Antonio

By Gerald E. Poyo, JOSÉ CISNEROS, Gilberto M. Hinojosa, JOS, Gerald Eugene Poyo, Gerald E. Payo

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Since its first publication in 1991, this history of early San Antonio has won a 1992 Citation from the San Antonio Conservation Society and a Presidio La Bahía Award from the Sons of the Republic...

Hydrogeological Investigations And Monitoring Groundwater Modeling

By Gerald E. Payo

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Lab Analyst Study Guide

By Gerald E. Payo

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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.