John Behler Books

The Amphibians and Reptiles of New York State: Identification, Natural History, and Conservation

By Glenn Johnson, Richard Bothner, John Behler, Peter K. Ducey, James P. Gibbs, Alvin R. Breisch

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First field guide

By John Behler

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Explores the world of reptiles, discussing their subspecies and races, anatomy, behavior, and habitat and providing photographs and detailed descriptions of individual species.

Alligators & crocodiles

By John L. Behler

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Alligators and Crocodiles WorldLife Library

By John Behler, Deborah Behler

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Amphibians and Reptiles of New York State

By Glenn Johnson, John Behler, Peter K. Ducey, James P. Gibbs, Alvin R. Breisch

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Reptiles

By John L. Behler

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Explores the world of reptiles, discussing their classification, anatomy, behavior, and habitat, and provides a field guide to species found in North America and elsewhere.

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.