While it states Pittsburgh/Allegheny area, Don’s List is much, much more. You will find links to many city directories, institutions, yearbooks, census rolls, military listings, guides to help locating information and more. This isn’t just for Pittsburgh and surrounding area, there is information for many states and locations. What this site lacks in visual appeal is more than made up for in content.
I found this pdf file on the internet and thought I’d share it here. It is a listing of genealogical resources in US Federal Depository Libraries. You may find some hidden gems for locating documents and information. It was last updated in 2006, however, it still warrants a look, I think. You can view and save to your computer here.