A meta-analysis of rates of return to agricultural R&D : ex pede Herculem? / - Washington, D.C. : International Food Policy Research Institute, c2000. - x, 148 p. : ill. ; 26 cm. - Research report ; . ISBN: 0896291162 (pbk.) Subjects--Topical Terms: AgricultureAgricultureRate of return. Dewey Class. No.: 338 INT 2000 C134 Or.