Robert Hollmann Books

William Barrett Travis

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William Barrett Travis was the commanding officer of the troops who defended the Alamo in 1836. He is best known for drawing a line in the sand and asking the men to cross the line and fight with h...

Susannah Dickinson

By Robert Hollmann

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The Last Cowboys

By Robert E. Hollmann, Robert Hollmann

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Davy Crockett

By Robert E. Hollmann, Robert Hollmann

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Jim Bowie: Frontier Legends

By Robert Hollmann

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Juan Seguin: Frontier Legends

By Robert Hollmann

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Susannah Dickinson: Frontier Legends

By Robert Hollmann

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Jim Bowie

By Robert Hollmann

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Davy Crockett

By Robert Hollmann

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Juan Seguin

By Robert Hollmann

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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.