Links verified 9/6/2018
- The British Library - exploring the world's knowledge
- The Library of Congress - Get it online; words, pictures, and sound. The library provides an online catalog .
- National Agricultural Library - One of four national libraries in the US, this institution is a major source for agricultural and related information.
- National Libraries from Around the World
- National Library of Medicine - The world's largest medical library
- New York Public Library - Online resources include catalogs, digital collections, and a kids section
- Public Libraries in the United States - select a state and then see a list of libraries organized by city within that state
- University of Pennsylvania - Library
- Yale University - Library