Steven Lehrer Books

"Hitler's infamous treatment of the Jews was well under way by the end of 1941, but it was at the Wannsee Conference of January 1942 that Reinhard Heydrich, chief of the Reich Security Service, off...

Hitler sites

By Steven Lehrer

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The Reich Chancellery and Fuhrerbunker complex

By Steven Lehrer

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"Germany's Nazi government made its primary headquarters in one of Berlin's oldest buildings: the Reich Chancellery. The site was frequented by Hitler and his inner circle. This complete history of...

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.