A
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Bibliography


1  Stringer, John.  The Science of Gravity.  2000, p. 4, 30.
2  Tiner, John.  Gravity.  2003, p. 9, 10, 29.
3  Gravitation.   http://en.wikipedia.org/wiki/Gravitation
4  Motz, Lloyd; Weaver, Jefferson.  The Story of Physics.  1989, p. 25, 40-42, 71, 266.
5  Hetherington, Norriss.  Planetary Motions:  A Historical Perspective.  2006, p. 154, 194.
6  Knight, Randall.  Physics for Scientists and Engineers:  A Strategic Approach.  3rd Ed.  2013, p. 355, 357.
7  Strathern, Paul.  Newton and Gravity.  1997, p. 13, 51, 98.
8  Adler, Robert.  Science Firsts.  2002, p. 134.
9  http://www.nasa.gov/centers/glenn/about/grcfaq.html#antigrav
and http://www.nasa.gov/centers/glenn/shuttlestation/station/microgex.html
10  http://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html
11  Gondhalekar, Prabhaker.  The Grip of Gravity.  2001, p. 192 - 193.