Percy Seymour Books

Astronomy

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"Astronomy: All That Matters, by leading expert Percy Seymour, is an innovative and intriguing introduction to exciting discoveries and important scientific theory. Each chapter starts with details...

Astrology

By Percy Seymour

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The Third Level of Reality

By Percy Seymour, Colin Wilson

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Adventures with Astronomy

By Percy Seymour

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Astronomy

By Percy Seymour, Patrick Moore

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Dark Matters

By Dr. Percy Seymour

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Dark Matters

By Percy Seymour

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The Scientific Basis of Astrology: Tuning to the Music of the Planets

By Percy Seymour

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Das Ticken des Kosmos

By Dennis Henry Bacon, Percy A. Seymour

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The birth of Christ

By Percy Seymour

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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.