Marion M. Markham Books

Twin detectives Katie and Mickey suspect that the disappearance of a marching band before a parade is linked to an attempted robbery at the local bank.

The April Fool's Day mystery

By Marion M. Markham

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The Dixon twins try to discover who put the snake in the school cafeteria flour bin on April Fool's Day, clearing an unjustly suspected classmate in the process.

The Valentine's Day mystery

By Marion M. Markham

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On Valentine's Day twin detectives Kate and Mickey investigate a case involving a vanished garnet pin and a maestro of classical music.

The St. Patrick's Day shamrock mystery

By Marion M. Markham

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On Saint Patrick's Day, the twin Dixon sleuths become involved in a mystery unfolding right next door.

April Fool s Day Mystery

By Marion M. Markham

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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.