The Pennsylvania State University studies.

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Item Link Original Source
Limited (search only)   no.20 University of Michigan
Limited (search only)   no.21-25 University of Michigan
Limited (search only)   no.24-29 University of Minnesota
Limited (search only)   no.31-35 University of Michigan
Limited (search only)   no.36-40 University of Michigan
Limited (search only)   no.36-41 University of Minnesota
Limited (search only)   no.42-46 University of Michigan
Limited (search only)   no.47-48 (1981-83) University of Minnesota
Limited (search only)   no.47-50 University of Michigan
Limited (search only)   no.48 University of California