by O.P. Dahama & O.P. Bhatnagar | .
by H.R. Chaturvedi | S.K. Mitra.
by T.N. Ananthakrishaan | .
by K.C. Misra | .
by R. Misra | .
by William O. Pruitt | .
by G.S. Puri | .
by S. K. Kapur | .
by Damaraju Raghaba Rao | .
by George Simpson | Fritz Kelfa.
by George W. Snedecor | William G. Cochran.
by John H. Mueller | Karl F. Schuesseler.
by Walter T. Federer | .
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