David Keefer Books

El Niño, Catastrophism, And Culture Change In Ancient America

By Kirk A. Maasch, Daniel H. Sandweiss, Michael Moseley, Jeffrey Quilter, David Keefer, S. Jeffrey K. Wilkerson, Paul Mayewski, David Hodell, James B., III Richardson, Brian Billman, Payson D. Sheets, Gary Huckleberry, Jason Yaeger, Paul Roscoe

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"El Nino is an extreme climate perturbation that periodically changes weather throughout the globe, often with dire consequences. First recognized in Peru, El Nino events are best known and documen...

Heat Pump Systems

By David Keefer, Meril Taylor

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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.