1. The Tobacco Situation; Bureau of Agricultural Economics, United States Department of Agriculture, October, p. 6, 1949.
2. Annual Report on Tobacco Statistics; United States Department of Agriculture, Washington, D. C., December, p. 77, Table 24, 1942.
3. Studies on Cigarette Smoke Irritation. I. Determination of Edema-Producing Properties of Certain Types of Cigarette Tobaccos