Não informado. (1953). Occupational health bulletin. Department of National Health and Welfare, Industrial Health Division.
Citace podle Chicago (17th ed.)Não informado. Occupational Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1953.
Citace podle MLA (8th ed.)Não informado. Occupational Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1953.
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