Mustafa,

You may also find this link useful. It is a research site of the George Eastman House, with lots of documentation, including historic stuff:

http://notesonphotographs.eastmanhou...itle=Main_Page

Especially this "Materials" page might be of some help:

http://notesonphotographs.eastmanhou...gory:Materials

And maybe the there linked summaries of the historic British Journal of Photography as compiled in a PDF:

http://www.arp-geh.org/FileUpload_demo/BJPAsummary1.pdf

Other possible useful links:
British photographic history - Information and discussion on all aspects of British photographic history
American Institute for Conservation of Historic and Artistic Works
Canadian Conservation Institute
http://www.getty.edu/conservation/

Marco