- Supreme Court of Iowa | Wednesday, November 21, 1990 | Cited 0 times
- Supreme Court of Iowa | Wednesday, October 21, 1987 | Cited 0 times
- California Supreme Court | Friday, February 24, 1967 | Cited 0 times
- Supreme Court of Iowa | Thursday, May 11, 1972 | Cited 0 times
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- Wisconsin Attorney General Reports | Friday, July 14, 1972 | Cited 0 times