Thielges, Bart A. creator Food and Agriculture Organization of the United Nations text Rome Food and Agriculture Organization of the United Nations 1985 monographic vi, 66 p. : ill. ; 30 cm. "This paper, prepared ... by Professor B.A. Thielges ... was presented as a background paper to the ad hoc Committee on Poplar Breeding during the 17th Session of the IPC at Ottawa, Canada, in October 1984"--P. iii. Poplar Poplar 634 FOO 1985 A053 Or. 9251022143