00358nam a2200121Ia 4500082002300000100002500023245007200048260003100120300001500151490006000166500000500226700000500231  a519.50184bR142.CC  aRaghavarao, Damaraju  aConstructions and combinatorial problems in design of experimentsb  aNew YorkbJohn Wileyc1971  axvi, 386p.  aWiley series in Probability and Mathematical Statistics  a  a