George Petrie Books

Church and state in early Maryland.

By Petrie George

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The Petrie Collection of the Ancient Music of Ireland

By G. Petrie

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The ecclesiastical architecture of Ireland

By Petrie George

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Church and state in early Maryland

By Petrie George

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The Petrie Collection of the Ancient Music of Ireland

By George Petrie

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Contains all of Petrie's original text, including song texts in Irish and English; the melodies; and his introduction. The text is prefaced with a biographical essay, which positions the collection...

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.

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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.