TY  - BOOK
AU  - Russell, Colin A.
TI  - The open univesity (Unit 15 & 16)
U1  - 735.21 
PY  - 1972///
CY  - Woltan Hall
PB  - Opent Univesity
KW  - Renaissance and reformation
N1  - Contents: Unit.15. The background to copernicus -- Unit.16. The copernican revolution
ER  -