Interested links
https://www.youtube.com/watch?v=dLCXqI2HMi0
http://ocw.mit.edu/courses/online-textbooks/
http://egyptscholars.org/ar/
http://www.greatachievements.org/
http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/index_html.html
https://www.asme.org/
http://bookboon.com/en/mechanics-ebooks