- 1969[subject unknown]Independent
- 1971[subject unknown]Independent
- 1974[subject unknown]Independent
- 1979[subject unknown]Other Research Personnel
- 1981[subject unknown]Independent
- 1985[subject unknown]Independent
- 1986[subject unknown]Library Readers
- 1987[subject unknown]Independent
- 1988[subject unknown]Library Readers
- 1989[subject unknown]Independent