Jan Spiller Books

Dictionary of American Military Biography Vol. 1

By Roger J. Spiller

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Dictionary of American Military Biography Vol. 2

By Roger J. Spiller

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Dict Amer Militaary Biog V3

By Roger J. Spiller

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Astrology for the Soul

By Jan Spiller

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For the first time ever, a famous spiritual astrologer shares the secrets, previously known only to professionals, that hold the key to your future. Astrologer Jan Spiller shows you the key to dis...

A revolutionary approach to unlocking the transformative power of astrologyGet what you wish for in love ... happiness ... health ... career ... money ... and more!The Moon’s influence on human des...

Cosmic Love

By Jan Spiller

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A world-renowned astrologer reveals the path to successful relationships.... In this powerful guide, astrology expert Jan Spiller shows you how the practical science of astrology can lead to rea...

Spiritual Astrology: Your Personal Path to Self-Fulfillment

By Jan Spiller, Karen McCoy

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Astrologia Espiritual

By Jan Spiller, Karen McCoy

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James Fenimore Cooper V48 Pamphlets on American Writers

By Jan Spiller

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Spiritual astrology

By Jan Spiller

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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.