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3. Beeuwkes, H., Hahn, R. G., and Putnam, P. (1942). Ibid., 45, 165.
4. Branch, A. (1933). Tubercle (Lond.), 14, 337.
5. Buckle, G., and Tolhurst, J. C. (1948). J. Path. Bact., 60, 116. Chapman,J. S.,and Guy, L. R. (1958). A.M.A. J. Dis. Child., 96, 496.