- 1967[subject unknown]Research Assistants
- 1968[subject unknown]Research Assistants
- 1969[subject unknown]Research Assistants
- 1972[subject unknown]Independent
- 1973[subject unknown]Independent
- 1975[subject unknown]Library Readers
- 1977[subject unknown]Independent
- 1978[subject unknown]Independent
- 1979[subject unknown]Other Research Personnel
- 1980[subject unknown]Other Research Personnel
- 1981[subject unknown]Library Readers
- 1981[subject unknown]Other Research Personnel
- 1987[subject unknown]Library Readers
- 1988[subject unknown]Library Readers
- 1989[subject unknown]Other Research Personnel
- 1992[subject unknown]Library Readers: General
- 1994[subject unknown]Library Readers
- 1995[subject unknown]Library Readers
- 1996[subject unknown]Library Readers
- 1997[subject unknown]Library Readers