Não informado. (1924). Industrial hygiene bulletin. Department of Labor, Division of Industrial Hygiene.
Lua i Stíl Chicago (17ú heag.)Não informado. Industrial Hygiene Bulletin. New York: Department of Labor, Division of Industrial Hygiene, 1924.
Lua MLA (8ú heag.)Não informado. Industrial Hygiene Bulletin. Department of Labor, Division of Industrial Hygiene, 1924.
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