Richard Helms Books

A look over my shoulder

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"A Look Over My Shoulder begins with President Nixon's attempt to embroil the Central Intelligence Agency, of which Richard Helms was then the director, in the Watergate cover-up. Helms then recall...

Joker Poker

By Richard Helms

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Bobby J

By Richard Helms

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The Amadeus Legacy

By Richard Helms

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The Valentine Profile

By Richard Helms

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Juicy Watusi Pat Gallegher Mysteries

By Richard Helms

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JOKER POKER Pat Gallegher Mysteries

By Richard Helms

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Wet Debt Pat Gallegher Mysteries

By Richard Helms

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Bobby J.

By Richard Helms

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Grass Sandal

By Richard Helms

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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.