Constance J. Cooper Books

Delaware In Vintage Postcards

By Ellen Rendle, Constance J. Cooper, Ellen Rundle

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If a picture is worth a thousand words, then the 200 historic views in Delaware in Vintage Postcards provide eloquent commentary on the First State in the early part of the twentieth century. Captu...

To Market, To Market, In Wilmington: King Street & Beyond

By Constance J. Cooper

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The King Street Market is a vivid memory to virtually all Delawareans. The sights, sounds and smells of this once flourishing curbside market come to life again in To Market, To Market.

350 Years Of New Castle, Delaware: Chapters In A Town'S History

By Constance Cooper, Constance J. Cooper

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New Castle, Delaware, one of America's historical and architectural treasures, has a considerable history that began in 1651 when the town was founded as Fort Casimir by the Dutch West Indies Compa...

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.