Gustafson & Pensinger's "Proven Fox Trapping and Biology" Book shows how you can make large fox catches within a six mile radius. Like most trappers today, you enjoy fox trapping as a sport, have limited time and would like to improve your fox catch. You can do it! The authors have done this year after year by using the methods in this book. Gustafson is a professional biologist and has trapped fox for 25 years. Pensinger, an expert fox trapper, has trapped for over 35 years. 64 pages.