Comparative ;Merits of Narrow and Regular Gage Railways. Lequesne's Commutator. Speed of Carrier pigeons. Chills and Fever. Val de Travers Asphalte a Failure., scientific american, 1871-11-25

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Comparative ;Merits of Narrow and Regular Gage Railways. Lequesne's Commutator. Speed of Carrier pigeons. Chills and Fever. Val de Travers Asphalte a Failure., scientific american, 1871-11-25

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