TY  - BOOK
AU  - Appell, David
TI  - Comets
T2  - Out there
SN  - 0-7621-0313-2
AV  - QB721.A48 
CY  - Pleasantville
KW  -  Near--Earth objects
KW  -  Oort Cloud
KW  - Astronomy
KW  - Comets
ER  -