1. 1. Ritchie, L. S., Hunter, G. W. III, Pan, C. and Szewczak, J. T., Parasitological studies in the Far East. III. A preliminary report of an epidemiologic survey of Aomori Prefecture, Honshu, Japan, Japan. Med. J. 3 (6) : 365-371, 1950.
2. 2. Anonymous, Survey report on control of parasites, Publ. by San. Bur. of Japan, Min. Int. Affairs, Vol. II: 18-20, 1932.
3. 3. Ambo, H. and Ando, K., Investigations of carriers of Endamoeba histolytica in Hokkaido, Hokkaido Med. J. 24 (10) : 1-5, 1949.
4. 4. Ritchie, L. S., Hunter, G. W. III, Pan, C. and Yokogawa, M., Parasitological studies in the Far East. X. An epidemiologic survey on Hokkaido, Japan, Am. J. Parasitol. 36 (Suppl.) : 17, 1950 (Abstract) .
5. 5. Tigertt, W. D., Hunter, G. W. III and Ritchie, L. S., Parasitological studies in the Far East. I. Methods and review of Japanese literature, Japan. J. Med. Sci. and Biol. 5 (5) : 357-385, 1952.