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Diigo Bookmarks 04/13/2011

<p class="diigo-description"> Free university/college level textbooks </p> <p class="diigo-tags"> <span>tags:</span> <a href="http://www.diigo.com/user/knightnet/ebooks">ebooks</a> <a href="http://www.diigo.com/user/knightnet/education">education</a> <a href="http://www.diigo.com/user/knightnet/free">free</a> <a href="http://www.diigo.com/user/knightnet/reference">reference</a> </p>