Danny O'Leary Books

The case of the smart dummy

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Using clues derived from mathematical knowledge, Mathnet detectives Pat Tuesday and George Frankly solve a case involving a ventriloquist's stolen dummy and a suitcase filled with counterfeit money.

Clarece

By Martha J Vaught, Danny O Leary

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Case of the Unnatural

By David D. Connell, Jim Thurman, Danny O Leary

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Violent Gentleman

By Danny O Leary

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Violent Gentleman

By Danny O Leary

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Violent Gentleman

By Danny O Leary

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The case of the unnatural

By David D. Connell

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Mathnet detectives George Frankly and Pat Tuesday use their knowledge of number sequences to crack a code and solve the mystery surrounding the phenomenal performance of a minor league baseball pit...

The Map With a Gap

By David D. Connell, Jim Thurman

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The map with a gap

By David D. Connell

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Mathnet detectives Kate Monday and George Frankly use math skills like triangulation and scale to find a buried treasure in a ghost town.

Eustace and the Christmas Swim

By Martyn Thrussell, Remo Perini, Danny O Leary

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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.