Michael Castleman Books

Do you want to be a great lover and enjoy consistently great sex? Would you like reliable erections that don't wilt in the middle of lovemaking? Would you like superb ejaculatory control? Would you...

The New Healing Herbs

By Michael Castleman

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Straight from nature's medicine cabinet, the latest herbal discoveries that cure hundreds of health concerns without the dangerous side effects or high cost of prescription drugs.When compared to p...

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.