000			00426nam a2200157 4500
003			OSt
008			220602b |||||||| |||| 00| 0 eng d
020			_a0521339073
082			_a522 _bWAL
100			_aWalker, Gordon
245			_aAstronomical Observations _bAn Optical Perspective
260			_aCambridge: _bCambride university press, _c1987.
300			_axii,347p.; _bill. _c25cm
650		0	_aAstronomy
942			_2ddc _cLM
999			_c104722 _d104722