I am not sure to what forum I should be posting this but it looks like it may be appropriate here.
While searching for biographical information on Robert Demachy, I ran across a website that may be of interest to others here. The site is Luminous-Lint www.luminous-lint.com The site is still in the developemnt stage but the informaion already available is impressive. It consists of short articles and associated links about photographers, photo history, photo movements, and themes in photography. The site is sponsored by Amazon so there are a lot of links to books relevant to the subject of your search.
If any of this is of interest to you, I recommend taking a look.