Tapping the Earth for Electricity. The Harmful Effects of Ultra-Violet Hays on the Human Eye. Prizes for Essays on Street Cars. The Current Supplement., scientific american, 1908-10-24

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Tapping the Earth for Electricity. The Harmful Effects of Ultra-Violet Hays on the Human Eye. Prizes for Essays on Street Cars. The Current Supplement., scientific american, 1908-10-24

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