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Where in the West is Mark Spitzer? – UNP blog
Yampa River: Rusty crayfish invade headwaters – Coyote Gulch
Distribution, habitat associations, and conservation status
crayfish – Ogeechee Riverkeeper
Virile Crayfish (Faxonius virilis) - Species Profile
Rusty Crayfish National Invasive Species Information Center
Commercial crayfish harvest in Oregon and Washington as A. lbs
Crayfish in Crater Lake threaten newt population
The State of Crayfish in the Pacific Northwest - Larson - 2011
Crayster's Wyoming Crawfish Reports
You might not think about - Wyoming Game and Fish Department
The Bighorn River You Don't Know - Fly Fisherman
crayfish – Ogeechee Riverkeeper
Virile Crayfish - Montana Field Guide