Harold D. Langley Books

Social Reform in the United States Navy, 1798-1862

By Marian Talmadge And Iris Gilmore

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Roosevelt and Churchill

By Franklin D. Roosevelt, Francis L. Loewenheim, Harold D. Langley

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A history of medicine in the early U.S. Navy

By Harold D. Langley

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In this first detailed history of the development of medical treatment and professionalization in the early U.S. Navy, Harold Langley traces the evolution of medical practice from the time Congress...

A History of Medicine in the Early U.S. Navy

By Harold D. Langley

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Roosevelt and Churchill

By Franklin D. Roosevelt

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The Confederate Navy

By Robert Holcombe, Robert M. Browning, Royce Shingleton, Maurice Melton, Norman C. Delaney, Raimondo Luraghi, Harold D. Langley, David M. Sullivan

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Quarterdeck and Bridge

By James C. Bradford

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Leading naval historians provide informative, authoritative essays that tell the U.S. Navy's story through the lives of the officers who forged its traditions, from the war of independence to the p...

Crucible of Empire

By James C. Bradford

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Quarterdeck and Bridge

By James C. Bradford

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Roosevelt and Churchill Their Secret Warti

By Francis Loewenheim

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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.