David Halperin Books

San Foucault

By David Halperin

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Chasing the Flying Saucers

By Rick Hilberg, Andrew Colvin, Gray Barker, David Halperin

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Strange Case of Dr. M. K. Jessup

By David Paulides, John Keel, Gray Barker, Jeffery Pritchett, David Halperin

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Journal of a UFO Investigator

By David Halperin

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A sparkling debut novel set in the sixties about a boy's emotional and fantastical journey through alien worlds and family pain. Against the backdrop of the troubled 1960s, this coming-of-age nov...

Spells of the City

By Jean Rabe, Martin H. Greenberg

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Venture into Spells of the City, where a troll may be your toll collector on the George Washington Bridge…Harry the Book will be happy to place your bets in a spellbinding alternative New Yo...

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.