by Rao , N S Subba | .
by Subba Rao , N S | .
by O.P. Dahama & O.P. Bhatnagar | .
by K.C. Misra | .
by G.S. Puri | .
by Damaraju Raghaba Rao | .
by Walter T. Federer | .
by George W. Snedecor | William G. Cochran.
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