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Portland, Oregon Portland (lớp tàu tuần dương) Portlet Portland, Victoria Portland Portland, Maine Portland International Jetport Portland Pattern Repository Portland, Tennessee Portland, Quận Dodge, WisconsinTài liệu tham khảo
WikiPedia: Portland_(lớp_tàu_tuần_dương) http://www.globalsecurity.org/military/systems/shi... http://www.hazegray.org/danfs http://www.historyofwar.org/articles/weapons_USS_I... http://www.historyofwar.org/articles/weapons_USS_P... https://books.google.com/books?id=rp-jAAAAMAAJ https://www.nytimes.com/2001/07/14/us/captain-once... https://www.history.navy.mil/research/histories/sh... https://www.history.navy.mil/research/histories/sh... https://commons.wikimedia.org/wiki/Category:Portla...