TY  - GEN
AU  - NEWTON, Isaac
AU  - HUYGENS, Christian
TI  - Mathematical principles of natural philosophy
AV  - AC 1 .G7 
PY  - 1952///
CY  - Chicago
PB  - William Benton
KW  - Mechanics --Early works to 1800
KW  - Celestial mechanics --Early works to 1800
KW  - Optics --Early works to 1800
KW  - Light, Wave theory of --Early works to 1800
KW  - Refraction, Double --Early works to 1800
ER  -