TY  - BOOK
AU  - Butler, F E
AU  - 
TI  - Signpost to the stars
U1  - 523.8 
PY  - 1970///
CY  - London
PB  - George Philip
KW  - Astronomical physics
KW  - Physics, Astronomical
KW  - Astrophysics
KW  - Spectroscopy
KW  - black holes
KW  - Spectrum analysis
KW  - Astronomy
KW  - Physics
KW  - Stars
ER  -