The records of NICH span the years from 1908 to 1983 with the bulk of the material covering the years 1912 to 1930; there is little information about the period from 1930 to 1960. The records include scattered correspondence, some of which refers to financial bequests and contracts with Health and Welfare, and annual and monthly reports. The records also contain the minutes of the Board of Directors (1909-1959), as well as several bookkeeping ledgers and the Superintendent's day books. Approximately one quarter of the records consist of photographs. Also included are scrapbooks and printed materials such as NICH promotional literature and newspaper clippings.