US Holocaust Memorial Museum Library
- Resources for family history and other research as well as access to the online catalog.
- http://www.ushmm.org/research/library/

The Library Company of Philadelphia
- Specializes in the history and background of American culture from the colonial period to the end of the nineteenth century; with an overview of the collection, access to the online catalog, and general information.
- http://www.librarycompany.org/