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1. Investigation 82

2. Investigations 4

3.
See Also Criminal investigation
60

4.
See Also Accident investigation
1

See Also Parapsychology -- Investigation

6.
See Also Governmental investigations
1

See Also Missing persons -- Investigation.

8. Investigations -- Drama. 9

9. Investigations -- Examinations. 1

Investigations -- Examinations, questions, etc.

11. Investigations -- Fiction. 47

12. Investigations, Governmental 0

13.
See Governmental investigations
1

14. Investigations -- Handbooks, manuals, etc. 12

15. Investigations -- Juvenile fiction. 7

16. Investigations -- Juvenile films. 1