Industrial classification code. - United States. Social Security Board. Committee on Industrial Classification Practices (Washington, D.C., Federal Security Agency, Social Security Board, 1942)
I. Description of industries.--II. Manufacturing index.--III. Nonmanufacturing index.
Reproduced from type-written copy.
"Prepared by the Social Security Board, Committee on Industrial Classification Practices."--Foreword.
Keywords: Industries -- United States -- Classification