$ A YEAR. LETTER CANCELING MACHINES AT THE NEW YORK POST OFFICE. LETTER CANCELING MACHINES IN THE UNITED STATES POST OFFICE NEW YORK CITY., scientific american, 1896-04-18

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$ A YEAR. LETTER CANCELING MACHINES AT THE NEW YORK POST OFFICE. LETTER CANCELING MACHINES IN THE UNITED STATES POST OFFICE NEW YORK CITY., scientific american, 1896-04-18

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