United States. Bureau of Plant Industry. (1938). Symptoms on field-grown tobacco characteristic of deficient supply of each of several essential chemical elements. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Plant Industry. Symptoms on Field-grown Tobacco Characteristic of Deficient Supply of Each of Several Essential Chemical Elements. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States. Bureau of Plant Industry. Symptoms on Field-grown Tobacco Characteristic of Deficient Supply of Each of Several Essential Chemical Elements. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.