Trudy Harris Books

Tally cat keeps track

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Alley cat Tally McNally loves to tally and loves to win but when his competitive streak gets him into trouble he has to rely on his friends for help.

Glimpses of Heaven

By Trudy Harris, Don Piper

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Jenny Found a Penny Math Is Fun

By Trudy Harris

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The reader can help Jenny count her pennies--and nickels and dimes and quarters--as she saves the money to buy herself a very special present.

20 Hungry Piggies

By Trudy Harris, Andrew N. Harris

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Rhyming text expands on the nursery rhyme, "Hickory Dickory Dock," as a cat chases the mouse up the clock, followed by other animals, until midnight arrives and the tired creatures fall asleep. Inc...

20 Hungry Piggies

By Trudy Harris

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Jenny Found a Penny

By Trudy Harris

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Splitting the Herd

By Trudy Harris, Russell Julian

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Tally Cat Keeps Track

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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.