A Dyers' Manual
a colour illustrated book on natural dyes, including woad, weld, madder, lichens and indigo. With information about fibres, mordants and dyeing in schools.
http://www.adyersmanual.co.uk/

Viking Age Dyestuffs
Introduction to the colors, dyestuffs, and mordants used by Viking spinners and cloth weavers. Author: Carolyn Priest-Dorman.
http://www.cs.vassar.edu/~capriest/vikdyes.html

Application of Dyestuffs To Textiles, Paper, Leather and other Materials
Application of Dyestuffs To Textiles, Paper, Leather and other Materials - publ. 1920
http://www.straw.com/tan/ApplicationDyes1.html