TY  - BOOK
AU  - Newton,Isaac
TI  - Philosophiae Naturalis Principia Mathematica
AV  - QA 
PY  - 2009///
PB  - Project Gutenberg
KW  - Celestial mechanics -- Early works to 1800
KW  - Mechanics -- Early works to 1800
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/28233
ER  -