Allan D. Jacobs Books

Arithmetic In Verse And Rhyme

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Rhymes About The Concept Of Numbers, Rhymes In Which One Must Subtract And Add, And Rhymes That Pose Mathematical Riddles And Problems.

Sports And Games In Verse And Rhyme

By Allan D. Jacobs, George DeLara

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A compilation of poems about kite flying, fishing, sledding, swimming, and other outdoor activities.

Behind The Circus Tent

By Allan Jacobs, Allan D. Jacobs, Text By Allan D. Jacobs And Leland B. Jacobs, Ill. By Hans Baltzer

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As a young bareback rider prepares to enter the ring, she describes the various animals of the circus

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.