Iowa State University：1965/11/28-  

1965 MS: Experiment S40/11/28 　
1966 Iowa farm magazine S41/03 　
1967 ISU: MS S42/05/27 　
　 　 　 　
1988 AE again 1988/9/8 　
　 with Prof. Buchele 　

ISU: Agricultural Engineering Dept.:1999

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update 99/10/24