Mary C. Henderson Books

"Jo Mielziner (1901-76) was the most highly acclaimed scenic and lighting designer of the American theatre of the twentieth century. Spanning some five decades, his unusually long career coincided...

The city and the theatre

By Mary C. Henderson

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The City and the Theatre The History of New York Playhouses

By Mary Henderson

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"From America's most renowned theatre historian, here is the definitive study of two of Mary C. Henderson's most beloved subjects: New York City and the history of theatre in New York City. Complet...

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.