Donald Hamilton Books

Most people understand homeopathy as a treatment for people, but as this book shows, our four-legged friends can benefit from it as well. First published in 1999, Homeopathic Care for Cats and Dogs...

Matt Helm: The Vanishers

By Donald Hamilton

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People are vanishing without a trace. And the disappearances are getting closer to home – the next likely target is Mac, Matt Helm’s shrewd old boss. To get to the bottom of the mystery...

Matt Helm - The Demolishers

By Donald Hamilton

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Matt Helm was aware of Bultman – a legendary assassin, the leader of a group of fanatical revolutionaries, an ambitious criminal – but he had no business with taking him down. Until now...

Matt Helm - The Devastators

By Donald Hamilton

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On a lonely heath in northern Scotland they recovered the body of the third agent sent to complete a tricky mission. He had died from bubonic plague. Somewhere on the moors was a half-crazed scient...

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.