Holly Keller Books

Nosy Rosie

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Rosie the fox's excellent sense of smell is good for finding things, but she stops using it after everyone begins to call her "Nosy Rosie."

Nosy Rosie

By Holly Keller

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Rosie the fox's excellent sense of smell is good for finding things, but she stops using it after everyone begins to call her "Nosy Rosie."

Rock Collecting

By Holly Keller, Roma Gans

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Explains how to start a rock collection and how to recognize igneous, metamorphic, and sedimentary rocks.

Farfallina & Marcel

By Holly Keller

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A caterpillar and a young goose become great friends, but as they grow up they undergo changes which separate them for awhile.

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.