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Philip S. Callahan
Books by Philip S. Callahan
5 books
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Exploring the Spectrum
Philip S. Callahan
Acres USA
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Tuning in to Nature
Philip S. Callahan
Acres USA
28.00
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Ancient Mysteries, Modern Visions: The Magnetic Life of Agriculture
Philip S. Callahan
Acres U.S.A.
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Paramagnetism: Rediscovering Nature's Secret Force of Growth
Philip S. Callahan
Acres U.S.A.
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Tuning in to Nature: Solar Energy, Infrared Radiation,&the Insect Communication System
Philip S. Callahan
Devin-Adair Pub
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