http://www.flashcardexchange.com/tag/63cards www.flashcardexchange.com: 63cards Flashcards en-us Thu, 16 Feb 2012 01:05:44 PST Thu, 16 Feb 2012 01:05:44 PST support@flashcardexchange.com 720 http://www.flashcardexchange.com/flashcards/view/1037728 just equations/facts 2010-03-04 http://www.flashcardexchange.com/flashcards/view/1037728 http://www.flashcardexchange.com/flashcards/view/353969 just equations/facts 2006-05-10 http://www.flashcardexchange.com/flashcards/view/353969