1. Improvement of agricultural production by pesticides;Ahrens,1985
2. Physical parameters affecting aircraft spray application;Akesson,1984
3. Rope wick applicator — tool with a future;Dale;Weeds Today,1980
4. Pesticide use and practices, 1982;Duffy,1982
5. Returns to corn and soybean tillage practices;Duffy,1984