...1954.
For the record, he earned his B.A. in 1950, and M.A. in 1952. I am grateful to Ruth Anne R. Allen,  Executive Secretary, Department of Philosophy, University of Minnesota, for this information.
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...details.)
I am grateful to my former Buffalo colleague, Richard T. Hull,  for this information.
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William J. Rapaport
Fri Jan 14 15:22:30 EST 2000