TY  - BOOK
AU  - Ptolemy; Copernicus, Nicolaus; Kepler Johannes
TI  - The Almagest On the Revolutions of the Heavently Spheres Epitome of Copernican Astronomy The Harmonies of the World
U1  - 030 
PY  - 1952///
CY  - Chicago; 
PB  - William Benton
KW  - English; Encyclopedia
ER  -