 | Lake States Forest Tree Improvement Conference (10th : 1971 : Madison, Wis.) mn | (1) |
 |
 | Lake States Forest Tree Improvement Conference (10th : 1971 : Madison, Wis.) mn; Joint proceedings of the tenth Lake States Forest Tree Improvement Conference and the seventh Central States Forest Tree Improvement Conference, September 22-24, 1971. : North Central Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1973. | |
|