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References <br /> Knight,Anthony P.,Walter,Richard <br /> G.,lst Edition,2001,A Guide to <br /> Plant Poisoning of Animals in North <br /> America. <br /> Stubbendieck,James,Geir Friisoe,Margaret <br /> Bolick,3rd Edition,2003,Weeds <br /> of Nebraska and the Great Plains, <br /> Nebraska Department of Agriculture. <br /> Whitson,Tom,Larry Burrill,Steven Dewey, <br /> David Cudney,B.Nelson,Richard Lee, <br /> Robert Parker,9th Edition,2006,Weeds <br /> of the West,the Western Society of <br /> Weed Science. <br /> Colorado State Parks,Best Management <br /> Practice,Weed Profile,Russian <br /> thistle,http://parks.state.co.us/ <br /> SiteCollectionlmages/parks/Programs/ <br /> ParksResourceStewardship/Russian%20 <br /> Thistle.pdf. <br /> Larimer County Weed District,4th <br /> edition,Weed Management Reference <br /> Guide,wwwlarimer.org/weeds/weed_ <br /> management_guide.pdf. <br /> USDA NRCS,Plants Database,Plant <br /> Guide Kochia http://plants.usda.gov/ <br /> plantguide/pdf/pg_basc5.pdf. <br /> 1 <br /> Colorado State University,U.S.Department of Agriculture and Colorado counties cooperating.CSU Extension <br /> programs are available to all without discrimination.No endorsement of products mentioned is intended nor is <br /> criticism implied of products not mentioned. <br />