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Portland Portland, Oregon Portland (lớp tàu tuần dương) Portland, Victoria Portland, Maine Portland International Jetport Portland Pattern Repository Portland, Tennessee Portland, Quận Dodge, Wisconsin Portlandia grandifloraTài liệu tham khảo
WikiPedia: Portland International Jetport http://www.gcr1.com/5010web/Rpt_5010.asp?au=PU&o=P... http://www.gcr1.com/5010web/airport.cfm?Site=PWM http://www.portlandjetport.org/ http://www.portlandjetport.org/about_the_portland_... //tools.wmflabs.org/geohack/geohack.php?language=v...