Lawrence Knorr Books

Gettysburg Eddie

By Lawrence Knorr

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Murders Massacres and Mayhem in the Mid Atlantic

By Lawrence Knorr, Joe Farrell, Joe Farley

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Wonder boy

By Lawrence Knorr

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"Carl Scheib, from Gratz, PA, was a young farm boy of 16 who was signed to a major league contract by Connie Mack of the Philadelphia Athletics. Carl enjoyed 11 years in the major leagues, interrup...

Danse Macabre

By Jean De Vauzelles, Austin Dobson, Lawrence Knorr, Hans Lutzelburger, Gilles Corrozet, Hans Holbein

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Wormleysburg

By Lawrence Von Knorr

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71 Years of Marriage

By Lawrence Knorr

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Relations of Milton Snavely Hershey

By Lawrence Knorr

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Relations of Milton Snavely Hershey

By Lawrence Knorr

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Pennsylvania Relations of Dwight D. Eisenhower

By Lawrence Knorr

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Descendants of Hans Peter Knorr

By Lawrence Knorr

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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.