Christopher J. Ryan Books

The Master Marketer

By Christopher J. Ryan, Drayton Bird

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Metacomet-Monadnock trail guide

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Great Rail Trails of the Northeast

By Craig P. Della Penna, Craig Della Penna

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Breakthrough To Math: Level 3: Workbook

By Ann K.U. Tussing, Stephanie Irwin, Christopher J. Ryan, New Jersey Bureau Of Adult Continuing Education, Rowan College

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Teacher's manual with extra exercises for the six volumes in level 2 of this series. Includes: understanding and comparing fractions, adding and subtracting fractions, multiplying and dividing frac...

Skiing the Pioneer Valley

By Bruce Scofield

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Metacomet Monadnock Trail Guide

By Christopher J. Ryan

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The Master Marketer

By Christopher J. Ryan

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Sam Houston and Mirabeau Lamar

By Christopher J. Ryan

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Metacomet Monadnock Trail Guide

By Christopher J. Ryan

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Breakthrough To Math. Level 3 Algebra, Book 4 : Exponents, Roots, And Polynomials

By Ann K.U. Tussing, Christopher J. Ryan, New Jersey Bureau Of Adult Continuing Education, Rowan College

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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.