Philip S. Callahan

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Nature's Silent Music: A Rucksack Naturalist's Ireland
Callahan, Philip S.

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� 8.41

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Exploring The Spectrum
Callahan, Philip S.

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� 10.84

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Birds and How They Function
Callahan, Philip S.

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� 18.53

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Tuning in to Nature: Solar Energy, Infrared Radiation,&the Insect Communication System
Callahan, Philip S.

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� 25.46

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The evolution of insects,
Callahan, Philip S

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� 26.25

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Insects and how they function
Callahan, Philip S

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� 68.79

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Paramagnetism: Rediscovering Nature's Secret Force of Growth
Callahan, Philip

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� 7.64

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Tuning in to Nature: Infrared Radiation and the Insect Communication System
Callahan, Philip

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� 10.08

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