Robert Arthur Books

The Mystery of the Vanishing Treasure

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The three investigators take on two mysteries: the disappearance of an ancient jeweled Japanese belt from a museum exhibit and the strange antics of a group of gnomes around an elderly woman's house.

3 Investigator s Bk of Mystery

By Robert Arthur

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The Mystery of the Two Toed Pigeon

By Robert Arthur

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The Secret of Terror Castle

By Robert Arthur

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The Three Investigators search for an authentic haunted house.

The Mystery of the Stuttering Parrot

By Robert Arthur

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The Mystery of the Whispering Mummy

By Robert Arthur

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Three young detectives undertake a case involving an Egyptian mummy that whispers, but only to one man.

The Mystery of the Green Ghost

By Robert Arthur

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The Mystery of the Vanishing Treasure

By Robert Arthur

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The Secret of Skeleton Island

By Robert Arthur

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The Three Investigators are assisted by a Greek youth as they search for clues to a mysterious thief on an island once inhabited by pirates.

The Mystery of the Fiery Eye

By Robert Arthur

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Three junior detectives solve a mystery involving a collection of antique busts, a legacy, a strange letter, and a red ruby.

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.