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<br />-8- Gravel Breaks 1164 <br />References <br />Gay, Charles W. and Don D. Dwyer. poisonous Range Plants. Cooperative <br />Extension Service, Circular 391, New Mexico State University, pp. I-21, <br />June 1967. <br />James, L. F, and et al. Plants Poisonous to Livestock in the Western <br />States. Agriculture Information Bulletin No. 415, pp. 1-90, November <br />1980. <br />Durrell, L. W., Rue Jensen and Bruno Klinger. Poisonous and Injurious <br />Plants in Colorado. Bulletin 412-A, pp. I-88, June 1952. <br />United States Department of Agriculture. 22 Plants Poisonous to Livestock <br />in the Western States. Agriculture Information No. 327, pp. 1-64, <br />April 1968. <br />