TY  - GEN
AU  - PTOLEMY
AU  - COPERNICUS, Nicolaus
AU  - KEPLER, Johannes
TI  - The Almagest
AV  - AC 1 .G7 
PY  - 1952///
CY  - Chicago
PB  - William Benton
KW  - Astronomy --Early works to 1800
KW  - Mathematics, Greek
ER  -