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Space Mail
Isaac Asimov, Martin H. Greenberg, Joseph D. Olander, Cyril M. Kornbluth, Chandler Davis, Patricia Nurse, Ray Russell, William Sambrot, Judith Merril, Sharon Webb, Fredric Brown, Jack Lewis, Gordon R. Dickson, Mildred Clingerman, A. E. van Vogt, Dean R. Lambe, Howard Fast, Daniel Keyes, George R. R. Martin, Barry N. Malzberg, Christopher Anvil, Anthony R. Lewis, H. Beam Piper, Murray Leinster · Del Rey Books
416 sayfa · 1980
Kategori yok
A meta-analysis of rates of return to agricultural R&D
Julian M. Alston, Connie Chan-Kang, Michele C. Marra, Philip G. Pardey, J. J. Wyatt · International Food Policy Research Institute
148 sayfa · 2000
Agriculture / Rate of return / Economic aspects / Evaluation / Research