A brief introduction to paper making, covering early Egyptian and Chinese paper, the contributions of such men as R?amur, Robert, and Keller, and the process of making paper from wood fibers.
A brief introduction to paper making, covering early Egyptian and Chinese paper, the contributions of such men as R?amur, Robert, and Keller, and the process of making paper from wood fibers.
Discusses the history, scientific principles, and practical and recreational uses of a variety of sports that utilize the wind in the air and on land, water, and ice.
A study of the evolution, physical characteristics, and living habits of bats, their relationship to man, and the myths and superstitions surrounding them.
Discusses the various types of caves, the uses people have found for caves, and the rules, equipment, and techniques involved in exploring caves, or spelunking.
