00392nam a2200145Ia 4500003000900000008004100009040001600050080001700066100002100083245003800104260004300142300000900185650004100194650001100235IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a535.316bSEL  aSelwyn, E. W. H. 0aTheory of lensescE. W. H. Selwyn  aLondonbThe Institute of Physicsc1955  a62p.  aAstronomy and Astrophysics Thesaurus  aOptics