Richard L. Armstrong Books

A Geologic Time Scale 1989

By W. Brian Harland, Alan G. Smith, David G. Smith, Richard L. Armstrong, Allen V. Cox, Lorraine E. Craig

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A Geologic Time Scale 1989

By W. Brian Harland, Alan G. Smith, David G. Smith, Richard L. Armstrong, Allen V. Cox, Lorraine E. Craig

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A Geologic Time Scale 1989 Wallchart Cambridge Earth Science

By Alan G. Smith, Walter Brian Harland, Richard L. Armstrong, David G. Smith Undifferentiated, Allen V. Cox, Lorraine E. Craig

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God alone knows which was right

By Richard L. Armstrong

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"According to legend, William H. Terrill had the phrase "God Alone Knows Which Was Right" inscribed on a monument to honor two of his fallen sons, generals who fought on opposite sides during the C...

11th Virginia Cavalry

By Richard L. Armstrong

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Battle of McDowell The Virginia Civil War battles and leaders series

By Richard L. Armstrong

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The Battle of Lewisburg

By Richard L. Armstrong

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25th Virginia Infantry and 9th Battalion Virginia Infantry

By Richard L. Armstrong

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Seventh Virginia Cavalry

By Richard L. Armstrong

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Nineteenth Twentieth Virginia Cavalry

By Richard L. Armstrong

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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.