Weeds of the West, Whitson et al. - One of the most extensively read weed identification books published. Life cycles and identification characteristics of more than 350 species considered weedy across the western U.S.
Biology and Management of Noxious Rangeland Weeds, Roger Sheley. - Description of the most important noxious weed species in western U.S. and various methods of management.
Biological Control of Invasive Plants in the United States, Eric Coombs. - A review of biological control agents and effectiveness for management of noxious weeds. Includes techniques for release, identification of agents and symptoms, monitoring, and geographical range.
Invasive Plants of Range and Wildlands and Their Environmental, Economic, and Societal Impacts, Celestine Duncan. - Summarizes scientific literature regarding economic, environmental, and societal losses to range and wildlands caused by 16 key invasive plants in the U.S.
Aquatic and Riparian Weeds of the West, Joe Ditomaso. - Life cycles and identification characteristics of aquatic and riparian weeds.
Horse Brochure - "Colorado's Poisonous Menace - Do You Know What Your Horse is Eating?"
Colorado Weed Management Association - Bundles of 25 Free plus shipping
Noxious Weeds of Colorado - A 162 page spiral-bound booklet featuring photos and descriptions of Colorado's noxious weeds. Colorado Weed Management Association - cwma.org
Garden Smart Colorado - A booklet highlighting native and non-invasive alternatives to some ornamental noxious weeds. Colorado Weed Management Association