L.F. Salzmann 
English Industries of the Middle Ages [PDF ebook] 

This book, originally published in 1913, makes no pretense to be a complete history of the early industrial life of England, but at the same time it does claim to be an introduction to the study of that subject and provides more than a bare outline of industrial conditions in pre-Elizabethan days. Student who are anxious to go more deeply into the subjects here treated can use this book as a road map and the footnotes as finger-posts to guide themselves to the heights of completer knowledge. (SNOVA)