TY  - BOOK
AU  - De Sitter W
TI  - Kosmos
U1  - 523.18 
PY  - 1932///
CY  - Cambridge
PB  - Harvard Univ. Press
KW  - Astronomy
KW  - Cosmology
N1  - A course of six lectures on the development of our insight into the structure of the universe, delivered for the Lowell Institute in Boston in November 1931
ER  -