Roberta Wiener Books

The Doubleday children's encyclopedia

By Roberta Wiener, John Paton

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Presents facts on more than 1300 subjects from Aardvark to Zoo.

The Doubleday children's encyclopedia

By Roberta Wiener, John Paton

Average: 0.00, 0 Ratings

Presents facts on more than 1300 subjects from Aardvark to Zoo.

Connecticut

By Roberta Wiener

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Delaware

By James R. Arnold, Roberta Wiener

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A detailed look at the formation of the colony of Delaware, its government, and its overall history, plus a prologue on world events in 1638 and an epilogue on Delaware today.

Georgia

By James R. Arnold, Roberta Wiener

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Maryland

By James R. Arnold, Roberta Wiener

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A detailed look at the formation of the colony of Maryland, its government, and its overall history, plus a prologue on world events in 1634 and an epilogue on Maryland today.

Massachusetts

By Roberta Wiener

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New Hampshire

By Roberta Wiener

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New Jersey

By Roberta Wiener

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A detailed look at the formation of the colony of New Jersey, its government, and its overall history, plus a prologue on world events in 1664 and an epilogue on New Jersey today.

New York

By James R. Arnold, Roberta Wiener

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A detailed look at the formation of the colony of New York, its government, and its overall history, plus a prologue on world events in 1624 and an epilogue on New York today.

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.