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Herman, D.E., et al. Provided by ND State Soil Conservation Committee. United States, North Dakota.
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Ray M. Filloon. Provided by National Agricultural Library. United States, Washington, Columbia National Forest, Trout Lake.
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H.A. Fowells. Provided by National Agricultural Library. United States, California.
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K.D. Swan. Provided by National Agricultural Library. United States, Idaho.
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Provided by National Agricultural Library. United States, Washington.
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Provided by National Agricultural Library. United States, Washington.
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Provided by National Agricultural Library.
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Britton, N.L., and A. Brown. Provided by Kentucky Native Plant Society.