TY - BOOK AU - By Mehrotra, P.C. AU - By V.S. Rustogi AU - By S.K. Raheja AU - By Satya Pal TI - Study of Variability and Trends of Yield Rates of High Yielding Varieties of Rice During Fourth And Fifth Five Year Plan Periods PY - 1987/// CY - New Delhi PB - Indian Agricultural Statistics Research Institute ER -