g The Nicaragua Canal Concession. The Manufacture of Coal Tar Dyes. The Increasing Use of Steel Castings. Wages and Earnings in Pennsylvania. The Projected Florida Ship Canal. Photographic Prizes. Curious Experiment in Magnetism. Progress in Utilization of Solar Heat. -4 C, scientific american, 1880-07-11

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g The Nicaragua Canal Concession. The Manufacture of Coal Tar Dyes. The Increasing Use of Steel Castings. Wages and Earnings in Pennsylvania. The Projected Florida Ship Canal. Photographic Prizes. Curious Experiment in Magnetism. Progress in Utilization of Solar Heat. -4 C, scientific american, 1880-07-11

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