About Our Collections
The Libraries physical collections comprise 1.5 million books and manuscripts, along with over 400,000 pieces of ephemera, microfilm, photo collections and a/v material, housed in over 20 locations in Washington, Maryland, New York, and Panama.
For more information about using our collections in person, please visit the appropriate branch library page for contact information, hours and to determine if you need an appointment.
If you would like to borrow a book, please make an inter-library loan request through your local public, school, or organizational library.
SI Digital Repository
A bibliography of publications by Smithsonian researchers and affiliated staff are maintained in Smithsonian Research Online (SRO.)
By Popular Request
Some of our more popular online resources