The Digital Public Library of America – a large scale digital library project launched by Harvard University – offers extensive digitized collections.  Their mission is to connect users to digital content through metadata records – information about an item – for “millions of photographs, manuscripts, books, sounds, moving images, and more from libraries, archives, and museums around the United States.”  Each record links to original content.

Fiddlin' Bill Hensley, mountain fiddler, Asheville, North Carolina (photo by Ben Shahn, taken as part of the Farm Security Administration) via DPLA

Additionally, the DPLA offers exhibitions housed on their site. The above photo is from “America’s Great Depression and Roosevelt’s New Deal.”

You can also search using the Timeline.  When you click on a time period, you receive a list of results from the decade.  This is a handy tool when researching a topic.  Try it out and see what primary source you discover!