John Halpern Books

Opium: How an Ancient Flower Shaped and Poisoned Our World

By John H. Halpern MD, David Blistein

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Let's visit a bicycle factory

By George Ochoa

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Text and photographs describe how the parts of a bicycle are assembled, how accessories are added, how inspectors check for defects, and how the bikes are shipped to stores across the country.

Opium

By John H. Halpern, David Blistein

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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.