John H. Watson Books

Dr. Jekyll and Mr. Holmes

By Loren D. Estleman

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Dr. Watson und der Fall Sherlock Holmes

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The West End Horror: A Posthumous Memoir of John H. Watson, M.D.

By Nicholas Meyer

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Sherlock Holmes Vs. Dracula: Or The Adventure of the Sanguinary Count

By Loren D. Estleman

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Dr. Jekyll and Mr. Holmes

By Loren D Estleman

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The West End Horror: A Posthumous Memoir of John H. Watson, M.D.

By Nicholas Meyer

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"Acquired" from a widow whose husband was descended from the distaff side of Holmes's family, this mystery finds Holmes solving a double murder in London's theater district.

The Seven Per Cent Solution

By John H. Meyer Nicholas Ed. Watson

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Word Processing

By John H. Watson, Watson John

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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.