- Western Washington Plants Known to be Poisonous to Horses (Horses for Clean Water, 2007)
- Selected Poisonous Plants of the Pacific Northwest | Animal Agriculture | Washington State University (Washington State University Extension College of Agriculture, Human & Natural Resources Sciences: Animal Agriculture Program)
- Protect Your Horses and Livestock from Toxic Plants (Washington Noxious Weed Control Board)
- Plants Poisonous to Livestock in the Western States (United States Department of Agriculture Information Bulletin No. 415, April 2011)
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