Charles Keller Books

Giggle Puss: Pet Jokes for Kids

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Going Bananas

By Charles Keller

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Jokes told in the form of conversations are illustrated with cartoon characters.

Crime Doesn't Pay: Law and Order Jokes

By Charles Keller

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A collection of jokes focusing on the law.

Growing Up Laughing

By Charles Keller

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Laughing: A Historical Selection of American Humor

By C. Keller, Charles Keller

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A collection of American humor from colonial times to 1969 with introductions to the selections tracing the development of humor in the United States.

Laugh Lines

By Charles Keller

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A collection from American folklore of jokes the reader can draw, including picture puzzles, story riddles, and catch tales.

The Little Witch Presents a Monster Joke Book

By Charles Keller

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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.