Rules and regulations of Bureau of entomology and plant quarantine :
effective June 1, 1939.
APA Citation
United States. Bureau of Entomology and Plant Quarantine. (1939). Rules and regulations of Bureau of entomology and plant quarantine: effective June 1, 1939. [Washington]: U.S. Govt. print. off..
MLA Citation
United States. Bureau of Entomology and Plant Quarantine. Rules And Regulations of Bureau of Entomology And Plant Quarantine: Effective June 1, 1939. [Washington]: U.S. Govt. print. off., 1939.
Warning: These citations may not always be complete (especially for serials).