The nature, ecology, and control of Canada thistle - Hodgson, Jesse M., 1912-; United States. Agricultural Research Service (Washington] Agricultural Research service, U.S. Dept. of Agriculture; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968)
Bibliography: p. 31-32.
Keywords: Canada thistle; Cirsium arvense