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- catalog contributor b6828169.
- catalog created "1941?]".
- catalog date "1941".
- catalog date "1941?]".
- catalog dateCopyrighted "1941?]".
- catalog extent "22, 23 leaves.".
- catalog issued "1941".
- catalog issued "1941?]".
- catalog language "eng".
- catalog publisher "[Washington?".
- catalog subject "Occupations Classification.".
- catalog title "Two-way conversion key for code symbols of the 1939 United States Employment Service and the 1940 census of population occupational classification systems.".
- catalog type "text".