Ray Djuff Books

Biological Weapons
Biological Weapons

By Richard C. Shelby

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The Prince of Wales Hotel
The Prince of Wales Hotel

By Ray Djuff

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High on a Windy Hill
High on a Windy Hill

By Ray Djuff

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Glacier's historic hotels & chalets
Waterton and Glacier in a Snap Fast Facts and Titillating Trivia
Glacier's Historic Hotels and Chalets
Glacier's Historic Hotels and Chalets

By Chris Morrison, Ray Djuff

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This unique book tells the fascinating stories of Great Northern Railway's hotels and chalet colonies in Glacier National Park, as well as the Prince of Wales Hotel in Waterton Lakes National Park....

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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.

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