Northern Rubber Boa - Montana Field Guide
Rubber Boa - Snake Facts
Wyoming Game and Fish Department - The northern rubber boa
Rubber boa Oregon Department of Fish & Wildlife
What's a bit scaley, wrinkly, - Grand Teton National Park
Rubber Boas found in California
Northern Rubber Boa - B.C. Reptiles & Amphibians
Northern Rubber Boa (Idaho Reptiles) · iNaturalist
Canadian Herpetological Society