It is with deep appreciation that we dedicate this
book to those who have made possible the opportunities that have been
ours down through the years:
Carson, Rachel. Silent Spring. Boston,
Houghton Mifflin Company, 1962.
Dubos, Rene. So Human an Animal. New York,
Charles Scribner's Sons, 1969.
Ehrlich, Paul. The Population Bomb. New York,
Ballantine Books, 1968.
Krutch, Joseph Wood. The Great Chain of Life.
Boston, Houghton Mifflin Company, 1957.
Leopold, Aldo. A Sand County Almanac. New
York, Ballantine Books, 1970.
Marx, Wesley, The Frail Ocean. New York,
Ballantine Books, 1970.
Zim, Herbert S. and Paul R. Shaffer. Rocks and
Minerals. New York, Golden Press, 1957.