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Notes and Queries
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The Transportation Problem in New York City - p114
doi:10.1038/scientificamerican02221896-114
The Comparative Economy of the Electric and the Cable Car Systems - p115
doi:10.1038/scientificamerican02221896-115a
The Underground Trolley Street Railway in New York City - p119
doi:10.1038/scientificamerican02221896-119