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 Proceeidngs of the 12th Lake States Forest Tree Improvement Conference,Aug.1976 Central States Forest Tree Improvement Conference,10th West Lafayette,1976