Traditional Tanning: Leather and Furskin by Lotta Rahme

From Back Cover:

Traditionally tanned leather is a wondrous product. It is resistant to rot, when wet, but retains the strength, flexibility and suppleness of raw hide when dry. There are many different ways to tan hides and furs. This book contains sections on the history, methods and chemistry of traditional tanning. It also includes practical recipes using fish liver oil, rapeseed oil, bark and alum. It discusses the methods best suited for various animals from goat to ostrich to moose.

She also has written a separate book devoted to fish skin tanning.