Bad Effect of Cement on Iron. Legislating against Thistles. Decay of the Obelisk at Central Park New York. The Magnesium Light., scientific american, 1885-10-24

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Bad Effect of Cement on Iron. Legislating against Thistles. Decay of the Obelisk at Central Park New York. The Magnesium Light., scientific american, 1885-10-24

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