While Byrne's is beautiful, I prefer having the cross-references and additional analysis of <a href="http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI1.html" rel="nofollow">http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI1....</a>.
Nice project, but usage of the long s "ſ" makes this somewhat unpleasant to go through. Also it's a medieval character, Euclid didn't know of it, so is it purely to decorate the text? To make it feel more ancient?