Doug Feldmann Books

St. Louis Cardinals past present

By Doug Feldmann

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El Birdos

By Doug Feldmann

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"This volume looks at the Cardinal teams of the 1967 and 1968 seasons. Beginning with the ownership shift in the early 1950s, it examines the events leading up to the opening of the new stadium and...

The 1976 Cincinnati Reds

By Doug Feldmann

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"The 1976 Cincinnati Reds were one of the last to be considered a "dynasty," and this book documents the season of one of the greatest teams in baseball history. During the pursuit of a second-stra...

Keith Magnuson

By Doug Feldmann

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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.