For those who don't read the HSM board, John Stevenson posted a link a few days ago the covers manufacturing in one area of England mostly in the first half of the last century. Some amazing pictures and details that will take days to read. Just click the link and go to the museum on the home page.
http://www.localhistory.scit.wlv.ac.uk/home.htm
http://www.localhistory.scit.wlv.ac.uk/home.htm