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Gore, A. (1992). Earth in the Balance. Boston, MA: Houghton Mifflin Company.

Hammond, Scully, Mast, & Powell. (1991). Environmental Almanac. Boston, MA:

Houghton Mifflin Company.

Johnson, G. (1990). Environmental Tips on how you can save this planet. Calgary,

Alberta: Detselig Enterprises.

Kralijic, M. (1992). The Greenhouse Effect. New York, NY: The H.W. Wilson

Company.

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