Free Books on Geometry at Project Gutenberg

There are three (so far) books at Project Gutenberg that are free and available to the public for download.
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The Foundations of Geometry by David Hilbert
Non-Euclidean Geometry by Henry Manning
An Elementary Course in Synthetic Projective Geometry by Norman Lehmer

In addtion, there is the following which has a chapter on Analytic Geometry (ch 15):
History of Modern Mathematics by David Eugene Smith