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John P O'Brien

1937
Graduate Student
Johns Hopkins University
1938
[position unknown]
Johns Hopkins University
1939
Graduate Student
Johns Hopkins University
1940
Graduate Student
Johns Hopkins University
1941
[position unknown]
Johns Hopkins University
1949
Assistant Professor Of Zoology
Marquette University

1937
Zoology 1937
Student
1938
Physiology 1938
Student

1936
[subject unknown]
Beginners
1938
[subject unknown]
Independent
1939
[subject unknown]
Independent
1939
[subject unknown]
Independent
1940
[subject unknown]
Independent
1941
[subject unknown]
Independent Investigators
1949
[subject unknown]
Indendent