Cathryn P. Sill Books

About Amphibians

By Cathryn P. Sill

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About Fish

By Cathryn P. Sill

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About Marsupials

By By Cathryn Sill Illustrated By John Sill

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Explore the world of koalas, kangaroos, and other marsupials in this award-winning beginner's guide to an unusual group of mammals—the marsupials.In this volume from the acclaimed About... se...

About Arachnids

By By Cathryn Sill Illustrated By John Sill

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Creepy crawlies and eight-legged wonders abound in this classroom favorite and beginner's guide to arachnids. In this book from the acclaimed About... series, educator and author Cathryn Sill uses...

About Habitats

By Cathryn P. Sill

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About Crustaceans

By By Cathryn Sill Illustrated By John Sill

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Any young seashore visitor or beachcomber will enjoy this beginner's guide to crustaceans from Cathryn and John Sill, creators of the celebrated About... series. In this volume from the series, edu...

About habitats

By Cathryn P. Sill

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About Habitats

By Cathryn P. Sill, John Sill

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About Habitats: Forests

By By Cathryn Sill Illustrated By John Sill

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This beginner's guide and classroom favorite from the creators of the About Habitats series explores the major attributes of forests. The author, an educator by training, uses simple, easy-to-under...

About Penguins

By By Cathryn Sill Illustrated By John Sill

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A gorgeous first glimpse into the natural world of penguins.Using clear and simple language, this addition to the acclaimed About... series teaches children what penguins are, how they look, how th...

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.