Catherine Gourley Books

Who Was Maria Tallchief?

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Born in 1925, Maria Tallchief spent part of her childhood on an Osage reservation in Oklahoma. With the support of her family and world-renowned choreographer George Balanchine, she rose to the top...

Who Is Maria Tallchief Who Was...

By Catherine Gourley

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Read for Your Life

By Catherine Gourley

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Beryl Markham

By Catherine Gourley

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Who Is Maria Tallchief

By Catherine Gourley

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War women and the news

By Catherine Gourley

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Sharks!

By Catherine Gourley

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A collection of facts and stories, both historical and traditional, about sharks, their behavior, and their interaction with people.

Wheels of time

By Catherine Gourley

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A biography of the engineer and industrialist whose innovative methods enabled his company to build and mass-produce reliable and inexpensive automobiles and whose latter years were devoted to esta...

Read for your life

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Read for your life

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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.