21. Higher- yielding human systems for agriculture /   Publication: Ithace : Cornell Univ. P., 1983 . 342 p. : Date:1983 Availability: Copies available: Turkeyen Campus Science & Technology [S539.7 H53] (1), Actions: Add to cart
22. Improved upland rice farming systems   Publication: Rome : FAO, 1994 . iv,117 p. : Date:1994 Availability: Copies available: Turkeyen Campus Science & Technology [SB191 R5 P35] (1), Actions: Add to cart