00440nam a2200157Ia 450000500170000000800460001703700120006304000210007504100130009608400230010910000220013224500380015426000510019230000140024365000250025720250508161650.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a001.424, DAYqFEDL  aDayton C Mitchell 0aDesign of educational experiments  aNew York, USAbMcGraw Hill Book Company c1970  axi, 441p.  aOperational Research