Beaver and Otter Trapping Open Water Techniques by Charles Dobbins Trapping Book

Beaver Otter Muskrat Trapping Techniques by Israelson 1970

Otter 2000 - Hal Sullivan - Book Open Water Otter Trapping

Guide to Trapping by Jim Spencer (2007 p'back raccoon mink otter trapline)

No Nonsense Beaver and Otter Trapping - Mike Marsyada - Book Trapping Supplies

Beaver and Otter Trapping Open Water Techniques by Charles Dobbins Trapping Book

Beaver Reoccupation and an Analysis of the Otter Niche in Great Smoky Mountains

THE PROFESSIONAL BEAVER AND OTTER TRAPPER