TY  - BOOK
AU  - Hodgson,Jesse M.
ED  - United States.
TI  - The nature, ecology, and control of Canada thistle
T2  - United States. Dept. of Agriculture. Technical bulletin
AV  - S21SB615.C4 .A72 no. 1386
U1  - 630/.8 s632/.S8 
PY  - 1968///]
CY  - Washington]
PB  - Agricultural Research service, U.S. Dept. of Agriculture; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.
KW  - Canada thistle
KW  - Cirsium arvense
N1  - Bibliography: p. 31-32
ER  -