1. Dean, M. H. T., Office International d'hygiÃne publique, Bull. mensuel, 30, 1294 (1938).
2. Gaud, M., Office International d'hygiéne publique, Bull. mensuel, 30, 1280 (1938).
3. Roholm, K., “Fluorine Intoxication” (London: Lewis, 1937).
4. Smith, M. E., Lantz, E. M., and Smith, H. V., “The Cause of Mottled Enamel, a Defect of Human Teeth", Univ. Arizona Tech. Bull., No. 32 (1931).
5. Shortt, H. E., McRobert, G. R., Barnard, T. W., and Nayar, A. S. M., Indian J. Med. Res., 25, 533 (1937).