William F. Hoffman Books

Polish surnames

By William F. Hoffman

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Polish Surnames

By William F. Hoffman

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First Names of the Polish Commonwealth

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Polish Surnames

By William F. Hoffman

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Polish surnames

By William F. Hoffman

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The author presents a compilation of his research and exploration into the origins and meanings of Polish surnames, with Volume I including narrative chapters on name history, structure and form, a...

Polish surnames

By William F. Hoffman

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Following the paper trail

By Jonathan D. Shea

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Polish Localities in the Russian Partition Their Parish Affiliations

By Jonathan D. Shea, William F. Hoffman

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In their words

By Jonathan D. Shea

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Index to the Obituaries and Death Notices Appearing in the Dziennik Chicagoski Complete Index Set

By Thomas L. Hollowak, William F. Hoffman

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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.