TY  - BOOK
AU  - Irion, Robert
TI  - Galaxies
T2  - Out there
SN  - 0-7621-0312-4.
AV  - QB857.I75 
CY  - Pleasantville
KW  -  Density wave theory
KW  -  Space sciences
KW  - Astronomy
KW  - Galaxies
ER  -