Keller Books

Interactions 1 A Listening Speaking Skills Book
Understanding Sociology
Understanding Sociology

By C Et Al Calhoun

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Understanding Sociology
ALEXANDER THE GRAP
ALEXANDER THE GRAP

By Charles Keller

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A collection of humorous riddles incorporating fruits and vegetables, such as, "What's a raisin? A worried grape."

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Count Draculations!
Count Draculations!

By Charles Keller

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A collection of humorous riddles about monsters.

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Growing Up Laughing
Growing Up Laughing

By Charles Keller

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The interscholastic coach
Laugh Lines
Laugh Lines

By

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Operating Systems: Communicating with and Controlling the Computer
Remember the A La
Remember the A La

By Charles Keller

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A collection of old and new riddles, including "What did the piece of pie say to the man who was about to eat it?"

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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.

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