Don't know where these belong, but I found them while browsing online. Really good information in here!

http://archive.org/details/practicalguideto00mariuoft
and
http://archive.org/details/libraryofamateur01amer

This one is filled with all sorts of stuff I know little about, looks to be more scientific in nature, Didn't really thumb through it yet.
http://archive.org/details/AppliedPhotography