19th century papers

Hi I am looking for information on ORIGINAL 19th century photo papers.
Any info websites books I can buy,pamphlets,etc.would be greatly appreciated
thanks Robert Wilkinson

photoresto@hotmail.com

An excellent place to start: http://albumen.stanford.edu/

Here's a good one and it looks like it's still available:
Amazon.com: Care and Identification of 19th-Century Photographic Prints: Books: James M. Reilly