Lawrence Treat Books

The Clue Armchair Detective

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Professor Plum, Mrs. Peacock, and the other characters from the board game Clue appear in a collection of short mysteries, which the reader solves with the aid of visual clues.

BT Clue Armchair Det

By Lawrence Treat

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My Cousin Phoebe 24 Solve Them Yourself Picture Mysteries Crime and Puzzlement

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You re the detective

By Lawrence Treat

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Get a clue 1

By Lawrence Treat

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Get a clue 2

By Lawrence Treat

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Tales of obsession

By Nancy Pickard, Ruth Rendell, P. D. James, Joan Hess, Lawrence Treat, Hig

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Murder on the Aisle

By Arte Johnson, Lawrence Treat, Gerald Tomlinson, Joan Richter, Ron Goulart

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audio cassette of short stories

You're the jury

By Norbert Ehrenfreund

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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.