00281nam a2200109Ia 4500082002000000100003900020245002900059260003500088300001000123500000500133700003300138  a518.54bB255.BC  aBarker, P. J. and Beveridge, W. T.  aBasic computer studiesb  aEdinburghbOliver & Boydc1970  a200p.  a  aBeveridge, W. T. ; jt. auth.