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To the Postmasters of the United States - p405
doi:10.1038/scientificamerican08281858-405f
Hoke's Improved Marking and Winding Square - p406
doi:10.1038/scientificamerican08281858-406
Hoke's Improved Marking and Winding Square - p406
doi:10.1038/scientificamerican08281858-406c