Richard Lowry's statistics book at Vassar is
<a href="http://faculty.vassar.edu/lowry/webtext.html">here</a>

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K-S test info <a href="http://www.physics.csbsju.edu/stats/KS-test.html">here</A> and look-up table <a href="http://www.soest.hawaii.edu/wessel/courses/gg313/Critical_KS.pdf">here</a>