Roy Doty Books

How much does America cost?

By Roy Doty

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Examines the components of the federal budget as illustrated by the Presidential recommendations for 1977.

How much does America cost?

By Roy Doty

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Examines the components of the federal budget as illustrated by the Presidential recommendations for 1977.

Where are you going with that energy?

By Roy Doty

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Introduces various sources of energy that have been used from the time of the cavemen to the present.

Where are you going with that energy?

By Roy Doty

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Introduces various sources of energy that have been used from the time of the cavemen to the present.

Gunga, your din-din is ready

By Roy Doty

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A collection of jokes, puns, gags, and riddles, answering such questions as "How does a Hawaiian baritone laugh?" and "Where did Noah keep his bees?"

Gunga, your din-din is ready

By Roy Doty

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A collection of jokes, puns, gags, and riddles, answering such questions as "How does a Hawaiian baritone laugh?" and "Where did Noah keep his bees?"

Pinocchio was nosey

By Roy Doty

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Jokes, riddles, puns, and gags accompanied by the author's own drawings.

Tinkerbell is a ding-a-ling

By Roy Doty

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A collection of jokes and riddles, including "What's the one thing all plumbers do? Put a drain on your wallet."

Tinkerbell is a ding-a-ling

By Roy Doty

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A collection of jokes and riddles, including "What's the one thing all plumbers do? Put a drain on your wallet."

Itch, sniffle & sneeze

By Alvin Silverstein

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Discusses what allergies are, the body's reactions to them, things people are allergic to, and how to cope with allergies.

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.

Roy Doty Books

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

What is an EAN and How Does it Relate to an ISBN?