TY  - GEN
AU  - Osterbrock, D. E., Ed.
AU  - O'Dell, C. R., Ed.
AU  - 
TI  - Planetary nebulae
U1  - 523.112 
PY  - 1968///
CY  - New York
PB  - D. Reidel Publishing
KW  - Planetary
ER  -