Walker, Gordon Arthur Hunter, 1936- Astronomical observations : An optical perspective / Gordon Walker. - Cambridge [Cambridgeshire] ; New York : Cambridge University Press, 1987. - xii, 347 p. : ill. ; 26 cm. - 522 . Includes index. Bibliogr.: p. [321]-341. ISBN: 0521325870 0521339073 (pbk.) Subjects--Topical Terms: Astronomical instruments.Astronomy--Technique.Optical instruments.Astrophysics. Dewey Class. No.: 522