- 1962[position unknown]
- 1963[position unknown]
- 1964[position unknown]
- 1965[position unknown]
- 1966[position unknown]
- 1967[position unknown]
- 1968[position unknown]
- 1969[position unknown]
- 1970[position unknown]
- 1971[position unknown]
- 1930[position unknown]
- 1931[position unknown]
- 1932[position unknown]
- 1934[position unknown]
- 1935[position unknown]
- 1936[position unknown]
- 1937[position unknown]
- 1938[position unknown]
- 1939[position unknown]
- 1940[position unknown]
- 1996[position unknown]
- 1983[position unknown]
- 1986[position unknown]
- 1987[position unknown]
- 1988[position unknown]
- 1989[position unknown]
- 1991[position unknown]
- 1968Visiting Investigator
- 1927[position unknown]