Geoffrey Trease Books

A flight of angels

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Sheila and her friends solve a 400-year-old mystery while exploring the caves under their historical city of Nottingham for a class project.

The barons' hostage

By Geoffrey Trease

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The lives of a teen-age boy laying claim to a barony and a teen-age girl whose marriage has been arranged by the King's adversary become closely entwined during the Barons' War in England.

Timechanges

By Geoffrey Trease

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The white nights of St. Petersburg

By Geoffrey Trease

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Cue for Treason

By Geoffrey Trease

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Nottingham

By Geoffrey Trease

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Word to Caesar

By Geoffrey Trease

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Black Banner Abroad Bannermere

By Geoffrey Trease

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Gates of Bannerdale

By Geoffrey Trease

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Bows Against the Barons

By Geoffrey Trease

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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.