I am looking for information on original papers that were used to produce 19th century photographs.Such as,company names that produced it,types of paper,weights of paper or any other information.Any source is ok such as the web,books or periodicals.any help would be greatly appreciated,as I am doing research on this subject

thanks zganie

It's not much but here are a few links from my favourites list:

http://www.paulmessier.com/pm/papers/dating.html
http://albumen.stanford.edu/library/monographs/reilly/chap5.html
http://www.kameraklub.co.za/historic.htm
http://www.kodak.com/US/en/corp/kodakHistory/eastmanTheMan.shtml

Kodak is a good place to start.
I hope this helps

Thank you very much littlecoo for your generous input especially the first and third link
zganie