Timothy Mulligan Books

The politics of illusion and empire

By Timothy Patrick Mulligan, Timothy Mulligan

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Lone Wolf: The Life and Death of U-Boat Ace Werner Henke

By Timothy Patrick Mulligan, Timothy Mulligan

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Lone wolf

By Timothy Mulligan

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Neither sharks nor wolves

By Timothy Mulligan

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Although countless books have been written about the U-boat war in the Atlantic, precious few facts have come to light about the men who served in the submarines that wrought such havoc on Allied s...

Guide to records relating to U.S. military participation in World War II

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Guide to Records Relating to U.S. Military Participation in World War II

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Records of the German Naval High Command Guides to the Microfilmed Records of the German Navy 1850 1945 No. 3

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Neither Sharks nor Wolves

By Timothy Mulligan

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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.