TY  - BOOK
AU  - Walker,Gordon Arthur H
TI  - Astronomical observations: an optical perspective 
SN  - 0521325870
PY  - 1987///
CY  - New York
PB  - Cambridge University Press
KW  - Astronomical instruments
KW  - Astronomy
KW  - Techniques
KW  - Optical instruments
KW  - Astrophysics
N1  - Includes bibliography and index; Open access
ER  -