Northeastern Forest Tree Improvement Conference 25th Northeastern Forest Tree Improvement Conference Lake States Forest Tree Improvement Confernce,13th,St.Paul,1977 Central States Forest Tree Improvement Conference,9th,Ames,1974 Central States Forest Tree Improvement Conference,8th,Colmbia,1972 Scientific research management conference Northeastern Forest Tree Improvement Conference,25th,Orono,1977 Lake States Forest Tree Improvement Conference,12th,Hickory Corners,Mich,1975