00337nam a2200121Ia 4500082002500000100003200025245005900057260004400116300001400160500000500174700002900179856000700208  a309.2509542bD229.FE  aDas, R. B. and Singh, D. P.  aFormulation and execution of block plans; a case study  aCalcuttabOxford University Pressc1968  axv, 154p.  a  aSingh, D. P. ; jt. auth.  df