TY  - BOOK
AU  - Shapley,Harlow
TI  - Source book in astronomy, 1900-1950 / 
U1  - 520.82 SHA 
PY  - 1960///
CY  - Cambridge : 
PB  - Harvard University Press, 
KW  - Astronomy
N1  -  "Identification and sources": p. 411-417
ER  -