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Structurae数据库中Harvard Bridge的数据 Department of Conservation and Recreation（英语：Department of Conservation and Recreation） National Bridge Inventory（英语：National Bridge Inventory）
Maintenance.. [2006-10-02]. （原始内容存档于2021-10-08）. Nationalbridges.com. National Bridge Inventory Bridges - 021702510010800. [2006-09-29]. （原始内容存档于2007-09-27）.
30號堪薩斯州州道
999903000990871. National Bridge Inventory. [2011-03-31]. [失效連結] Federal Highway Administration. NBI Structure 999903000990791. National Bridge Inventory. [2011-03-31]
National Register of Historic Places. National Park Service. 2010-07-09. Clayton B. Fraser. HABS/HAER Inventory: Park Avenue Bridge (Clifton Bridge,
Bradford, S. Sydney. The Brooklyn Bridge (PDF). National Register of Historic Places Inventory-Nomination. National Park Service. February 24, 1975 [2024-04-25]