Prof . Hermann Boland
Mozartstr.2
35460 Staufenberg
Tel 06406/ 6907
Hermann.Boland@agrar.uni-giessen.de
Prof. Timmons Roberts
Institute at Brown for Environment and Society
University of Brown
Box 1951, 85 Waterman Street
Providence, RI 02 91
j_timmons_roberts@brown.edu
Dr. Abubakr I. M. Hussein.
University of Khartoum, Faculty of Agriculture
Dept. of Agric. Economic,13314Shambat, Khartoum North, Sudan.
(Cellular) +249 9121 33391
