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Chlorofluorocarbons are known to be effective spray can propellants, solvents and refrigerators and were often used in deodorants, refrigerators and other goods. However, it was not known at the beginning of their use, the complex reaction that CFCs have on the earth s climate. Originally published in 1982, this report explores early research into the effect that CFCs have on the environment and provides guidance on how this emerging issue should be dealt with. This title will be of interest to students of Environmental Studies."

This guide to the snakes, frogs, turtles, and salamanders of North America aids in the identification of 212 species. Learn:

- How to tell the difference between reptiles and amphibians
- How and where to find them
- How to separate fact from fable

"Reptiles and Amphibians" includes full-color illustrations, up-to-date range maps, and a host of fascinating facts about these interesting and unusual animals.

Using clear text and detailed illustrations, Golden Guides from St. Martin's Press present accurate information in a handy format for the beginner to the expert. These...

Enjoy and Learn
Expert Knowledge
Easy-to-Read

This handy guide to the most common, important and showy North American insects will help the novice begin a fascinating study. Includes:
A key to insect groups
Mature and immature forms
How insects grow and develop and what they eat
How to find and observe them

Full color pictures, nontechnical language, and up-to-date range maps make this a gem of a guide for beginners at any age.

This guide will help you identify-quickly and easily-the birds you are most likely to see. It tells you:

What to look for
Where and when to look
How to attract birds

Range maps show where each bird is found, and handy tables at the back of the book contain a wealth of additional information about migration, eggs, nests, and food. This is the perfect bird book for beginners at any age.

Enjoy the wonders of the heavens and understand more fully what you see. This Golden Guide shows you how with 150 full-color illustrations, including:

Charts of the major constellations
Tables to help locate the planets
Up-to-date explanations of meteors, comets, eclipses, and other celestial objects

Ideal for classroom use, to take along on vacations, and for use at home.