Larry Holcombe Books

The Presidents And UFOs: A Secret History From FDR To Obama

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The UFO enigma has been part of our culture since the 1940s and is building to a worldwide explosion of acceptance today. Now, as governments around the world open their files and records on intern...

The Presidents and UFOs

By Larry Holcombe

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Presidents and UFOs

By Larry Holcombe, Stanton T. Friedman

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The Great River Disclosure

By LARRY, Holcombe, Larry Holcombe

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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.