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Portland Portland, Oregon Portland (lớp tàu tuần dương) Portland, Victoria Portland, Maine Portland International Jetport Portland, Tennessee Portland Pattern Repository Portland, Arkansas Portland, TexasTài liệu tham khảo
WikiPedia: Portland Pattern Repository http://c2.com/doc/oopsla87.html http://c2.com/ppr http://c2.com/ppr/. http://wiki.c2.com/?WikiWikiWeb