Henry S. Olcott Books

Isis in America

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Theosophical Society cofounder Colonel Henry Steel Olcott's memoirs cover his years with Madame Helena Petrovna Blavatsky and the birth of the American occult—part of the new Tarcher Supernatural L...

How to Cultivate and Preserve Celery

By Theophilus Roessle, Henry S. Olcott

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Spirit of Zoroastrianism

By Henry S. Olcott

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Eastern Magic and Western Spiritualism

By Henry S. Olcott

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Applied Theosophy

By Henry S. Olcott

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Spiritualism and Theosophy

By Henry S. Olcott

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Buddhist Catechism

By Henry S. Olcott

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Buddhist Catechism

By Henry S. Olcott

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Catecismo Budista

By Jorge Gudino, Henry S. Olcott, Jorge Enrique Gudino

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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.