na YOGYA-02090000003909 20090227020651.0 ind 010-020900000003909 631 Rob I ROBERTSON, C.A An Introduction to agricultural production economics and form management C.A. Robertson Cet. 1 New Delhi Tata MacGraw-Hill 1977 140 hlm ilus 21 cm Ekonomi pertanian YOPDYOG(B) 03-27-2006 1 Mrrtrev P000007516