Robert Lester Books

Crises in Panama and the Dominican Republic

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A guide to British Public Record Office Colonial Office class 5 files

By Robert Lester

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CIA research reports.

By Robert Lester

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"Primarily memos or brief monographs, including cables and weekly or regular situation reports, these documents encompass all aspects of African politics, economics, and public life. The entire se...

U.S. military intelligence reports.

By Robert Lester

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U.S. military intelligence reports

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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.