Walden par Thoreau, Henry David, 1817-1862

Global ecology in human perspective par Southwick, Charles H.

50 questions on the natural law what it is & why we need it. par Rice, Charles E.

In search of nature par Wilson, Edward O.

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Profiles of power & success fourteen geniuses who broke the rules par Landrum, Gene N.

I.D. how heredity and experience make you who you are par Gallagher, Winifred

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Building knowledge-based systems for natural resource management par Schmoldt, Daniel L. (Daniel Lee) 1953-

Encyclopedia of common natural ingredients used in food, drugs, and cosmetics par Leung, Albert Y.

Freshwater ecology principles and applications par Jeffries, Michael J. 1958-

The Philippine environmental quality report 1990-1995.