Donna Cassidy Books

Painting the musical city

By Donna M. Cassidy, CASSIDY D, Donna Cassidy

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Focusing on the work of John Marin, Joseph Stella, Arthur Dove, Stuart Davis, and Aaron Douglas, the author describes music as a cultural marker for American modernist painters who adopted the them...

Marsden Hartley s Maine

By Donna Cassidy

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Marsden Hartley (1877-1943) was a well-traveled American modernist painter, poet, and essayist, but it is his life-long artistic engagement with his home state of Maine that defines his career. Mai...

Marsden Hartley

By Donna M. Cassidy, Donna Cassidy

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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.