David C. Harper Books

A guide to U.S. coin identification features more than eighty thousand up-to-date prices, along with hundreds of illustrations, identification tips, grading guidelines, and collector tips for every...

North American coins prices 2011

By David C. Harper

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North American coins prices 2012

By Harry Miller, David C. Harper, Thomas Michael

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Presents descriptions and the latest prices on coins created in the United States, Canada, and Mexico.

2013 North American Coins Prices

By David C. Harper

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An illustrated price guide to coins minted in the United States, Canada, and Mexico since the colonial era, with listings in up to eleven different grades of condition and pricing based on the prec...

U.S. Coin Digest 2013

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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.