Design and analysis of experiments / M. N. Das, N. C. Giri. Das, M. N. (Manindra Nath), 1923- Giri, Narayan C., 1928- joint author. Experimental design. QA279 .D35 1979 311 DAD Includes bibliographical references and index. New Delhi : Wiley, c1979. c1979. 1979 Text ix, 295 p. ; eng