Might as well post other sites as well that were shared in the comment sections of the TF article:
http://bookfi.org/
http://scienceengineering.library.scilibgen.org/
http://bookzz.org/
I2p: http://u76v7ha6j4jmtz3k2lseaso5qy36lxs77klhovmptufwcodovatq.b32.i2p/
http://bookzz.org/