Bertrand Russell's “The Principles of Mathematics” in PDF and HTML Formats

Also:<p>Intro to Mathematical Philosophy: <a href="http:&#x2F;&#x2F;people.umass.edu&#x2F;klement&#x2F;russell-imp.html" rel="nofollow">http:&#x2F;&#x2F;people.umass.edu&#x2F;klement&#x2F;russell-imp.html</a><p>and Tractacus: Logico-Philosophicus: <a href="http:&#x2F;&#x2F;people.umass.edu&#x2F;klement&#x2F;tlp&#x2F;" rel="nofollow">http:&#x2F;&#x2F;people.umass.edu&#x2F;klement&#x2F;tlp&#x2F;</a>