 | Conference on Estrous Cycle Control in Domestic Animals (1964 : University of Nebraska) 4n | (1) |
| North American Conference on Mycorrhizae (1st : 1969 : University of Illinois) 4n | (1) |
| North Central Land Tenure Research Seminar (1963 : Chicago) 4n | (1) |
| Symposium of the Land-Grant University and World Food Needs (1967 : University of Illinois at Urbana-Champaign) 4n | (1) |
| Symposium on Statistical Hydrology (1971 : Tucson) 4n | (1) |