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by Ierland, E. Van; Oude Lansink, Alfons
by Tisdell, Clement A.
by B. Hill
by Thomas R. DeGregori (Professor of Economics, University of Houston, Texas)
by Milton C Hallberg (Professor Emeritus of agricultural economics at Pennsylvania State University)
by Seitz, Wesley D.; Nelson, Gerald C.; Halcrow, Harold G.
by Kimhi, Ayal; Finkelshtain, Israel
by Department of Agriculture & Cooperation, Directorate of Economics & Statistics,
by Unknown
by Van Ierland, Ekko C.; Oude Lansink, A. G.