Gregory William Mank Books

It's alive!

By Gregory W. Mank

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Women in horror films, 1930s

By Gregory W. Mank

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Women in Horror Films

By Gregory William Mank

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John Carradine played a wildly varied series of characters - those he constructed for himself as well as those he played on stage and in film. And what characters they were, ranging in real life fr...

Hollywood Cauldron

By Gregory William Mank

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Women In Horror Films 1930s

By Gregory William Mank

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Women In Horror Films 1940s

By Gregory William Mank

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The very witching time of night

By Gregory W. Mank

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"The book covers unusual and often surprising areas of horror film history from the harrowingly tragic life of Dracula's leading lady, Helen Chandler, as intimately remembered by her sister-in-law,...

Laird Cregar

By Gregory William Mank

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The Hollywood hissables

By Gregory W. Mank

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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.