http://www.flashcardexchange.com/tag/pir www.flashcardexchange.com: pir Flashcards en-us Mon, 28 May 2012 06:48:56 PDT Mon, 28 May 2012 06:48:56 PDT support@flashcardexchange.com 720 http://www.flashcardexchange.com/flashcards/view/1746983 PIR since Jan '10 2011-04-20 http://www.flashcardexchange.com/flashcards/view/1746983 http://www.flashcardexchange.com/flashcards/view/380125 from PIR article 2006-09-16 http://www.flashcardexchange.com/flashcards/view/380125