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References
1.
Ministry of Health
: Reports on Public Health and Medical Subjects , No. 23. 1924 . H.M. Stationery Office .
2.British Medical Journal , 1937 , i , 1079 .
3.
Industrial Health Research Board
: Report No. 75 . 1936 . H.M. Stationery Office .
4.
British Empire Cancer Campaign
: Thirteenth Annual Report , 1936 .
5.
United States Treasury Department
: Public Health Reports , August I4th, 1931 , and January 5th, 1934 .
6.
Ibid., February 22nd and April I2th, 1935.