Daniel Cohen Books

What's happening to our weather?

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Discusses changing weather trends over the years, possible causes, and possibilities of doing something about the weather.

The case of the long-lost twin

By Dan Cohen

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When Miss Tromly dies, a woman posing as her twin sister threatens to cheat Miss Tromly's housekeeper out of her inheritance.

The case of the missing poodle

By Dan Cohen

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A poodle disappears from a dog show and sisters Ruthann and Polly help Officer Greenwood find the dognapper.

The mystery of the faded footprint

By Dan Cohen

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Two sisters assist their police officer friend in following clues to find who stole a wallet.

The case of the Spanish stamps

By Dan Cohen

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While visiting Mexico City with their parents, Ruthann and Polly solve the mystery of two missing Spanish stamps that Ruthann had wanted to buy for her collection.

Masters of horror

By Daniel Cohen

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Profiles five superstars of horror films, and discusses notable contributions by directors, writers, special effects and make-up artists, and other actors.

Horror in the movies

By Daniel Cohen

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Defines the horror movie and discusses outstanding horror movies from 1920 to the present.

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.