United States. Bureau of Plant Industry. (1920). Inventory of seeds and plants imported by Office of Foreign Seed and Plant Introduction during period from Oct. 1 to Dec. 31, 1920. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Plant Industry. Inventory of Seeds and Plants Imported by Office of Foreign Seed and Plant Introduction During Period from Oct. 1 to Dec. 31, 1920. [Washington]: GPO, 1920.
MLA (9th ed.) CitationUnited States. Bureau of Plant Industry. Inventory of Seeds and Plants Imported by Office of Foreign Seed and Plant Introduction During Period from Oct. 1 to Dec. 31, 1920. GPO, 1920.
Warning: These citations may not always be 100% accurate.