A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. Vol. XXXIIINo. GRAND CENTRAL DEPOT SIGNAL SYSTEM. GRAND CBE TRAL DEPOTTRAIN DESPATCHER'S, scientific american, 1875-12-25

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A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. Vol. XXXIIINo. GRAND CENTRAL DEPOT SIGNAL SYSTEM. GRAND CBE TRAL DEPOTTRAIN DESPATCHER'S, scientific american, 1875-12-25

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