TY  - BOOK
AU  - Annie J.Cannon
AU  - Cannon,Annie J.
TI  - the Henry Draper Extension
U1  - B611C58f930 
PY  - 1926///-1936
CY  - Cambridge  
PB  - Publisher by the Observatory
KW  - Astrophysics
KW  - Catalogue
KW  - extension
KW  - Star Catalogue-Extension
ER  -