Invisible Microbes. A Relic of Early San Francisco. Fig. 8The Generation of a Symmetrical inti-Parallelogram. Fig. 9The Generation of an Isosceles Crank Gear., scientific american, 1908-03-21

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Invisible Microbes. A Relic of Early San Francisco. Fig. 8The Generation of a Symmetrical inti-Parallelogram. Fig. 9The Generation of an Isosceles Crank Gear., scientific american, 1908-03-21

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