John S. Glasby Books

The wheel spins thirteen

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In Sharky Dexter's casino in Los Angeles, a man beats the crooked roulette wheel. He places a large bet on number thirteen, which comes up. He lets it ride for a second time and wins again, then st...

Dark conflict

By John S. Glasby

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Simon Merrivale owns a mask and headdress, and the legend is that whoever comes into contact with them will find their body taken over by the long-dead Shaman at full moon. Merrivale is dragged fro...

The Undead

By John Glasby

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The Substance of a Shade

By John Glasby

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The Substance of a Shade

By John Glasby, Richard Dalby, Paul Lowe

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Boundaries of the Universe

By John S. Glasby

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Directory of Plants Containing Secondary Metabolites

By J. S. Glasby

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Variable Star Observer s Handbook

By John Glasby

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Boundaries of the Universe

By John S. Glasby

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Boundaries of the Universe

By John S. Glasby

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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.