Trudy Harris Books

Where Curlews Cry

By Trudy Harris, Elizabeth Gill

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Splitting the Herd

By Trudy Harris, Russell Julian

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Math expressions

By Karen C. Fuson

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This set of grade 1 math resources includes units on early number activities; operations and simple equations; story problem strategies; basic ten-structured concepts; ten-structured applications;...

One Hundred Days of School

By Trudy Harris, Beth Griffis Johnson

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Tally Cat Keeps Track

By Trudy Harris, Andrew N. Harris

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Say Something Perico

By Cecilia Rebora, Trudy Harris

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100 Days of School

By Trudy Harris, Beth Griffis Johnson

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Pattern Bugs

By Trudy Harris, Anne Canavari Green

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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.