Clark, Tim and Harvey, Ann. 1989. Rare, Sensitive, and Threatened Species of the Greater Yellowstone Ecosystem. Northern Rockies Conservation Cooperative. Montana Natural Heritage Program, The Nature Conservancy – Idaho, Montana, and Wyoming Field Offices, & Mountain West Environmental Services.

Clark, Tim and Harvey, Ann. 1989. Rare, Sensitive, and Threatened Species of the Greater Yellowstone Ecosystem. Northern Rockies Conservation Cooperative. Montana Natural Heritage Program, The Nature Conservancy – Idaho, Montana, and Wyoming Field Offices, & Mountain West Environmental Services.

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