- 1947[subject unknown]Research Assistants
- 1948[subject unknown]Beginners
- 1950[subject unknown]Independent
- 1951[subject unknown]Independent Investigators
- 1953[subject unknown]Independent Investigators
- 1954[subject unknown]Independent Investigators
- 1957[subject unknown]Independent
- 1958[subject unknown]Independent
- 1959[subject unknown]Independent
- 1961[subject unknown]Independent
- 1962[subject unknown]Independent
- 1952[subject unknown]Corporation Member
- 1953[subject unknown]Corporation Member
- 1954[subject unknown]Corporation Member
- 1955[subject unknown]Corporation Member
- 1956[subject unknown]Corporation Member
- 1957[subject unknown]Corporation Member