Adams County Parks and Community Resources Department http://www.co.adams.co.us/
Boulder County Weeds Division http://www.bouldercounty.org/live/environment/land/pages/weeds.aspx
Weld County Weed Division http://www.co.weld.co.us/Departments/PublicWorks/WeedManagement/index.html
Larimer County Weed Control District http://www.co.larimer.co.us/weeds/
Colorado
Noxious Weed Mgt. Program http://www.colorado.gov/cs/Satellite/Agriculture-Main/CDAG/1167928159176
Colorado
Weed Management Association http://www.cwma.org
Colorado
Native Plant Society - http://www.conps.org
Colorado
Natural Heritage Program http://www.cnhp.colostate.edu/
The
Nature Conservancy Colorado Field Office http://www.nature.org/colorado
North
American Weed Management Association http://www.nawma.org
BLM
Weed Education http://www.blm.gov/wo/st/en/prog/more/weeds.html
USDA
NCRS Plants Database http://plants.usda.gov/
Chemical
& Pharmaceutical Press, Inc (labels, supplemental
labels, & MSDSs) http://www.greenbook.net
National
Pesticide Info Center (NPIC) http://ace.orst.edu/info/npic/
Extension Ask an Expert http://www.extension.org/ask
