TY  - BOOK
AU  - Lang Kenneth R
AU  -  Gingerich Owen
TI  - Source book in astronomy and astrophysics 1900-1975
U1  - B9, L9 
PY  - 1979///
CY  - Cambridge
PB  - Harvard University Press       
KW  -  Astrophysics
KW  - Astronomy
ER  -