Robert L. Rowan Books

Gay Health Guide

By Robert L. Rowan

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Your prostate: what it is, what it does, and the diseases that affect it

By Robert L. Rowan

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How to control high blood pressure without drugs

By Robert L. Rowan

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"Discover the truth about salt and potassium, fatty food and cholesterol, type A behavior, relaxation exercises, biofeedback, smoking and alcohol. Includes a full month of recipes."

Control High Blood Pressure Without Drugs

By Constance Schrader, Robert Rowan

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How to control high blood pressure without drugs

By Robert L. Rowan

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Kroger How to Control High Blood Pressure Without Drugs

By Robert L. Rowan

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Men and their sex

By Robert L. Rowan

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Men and Their Sex

By Robert L. Rowman

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Randalls Tom Thumb How to Control High Blood Pressure Without Drugs

By Robert L. Rowan

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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.