There’s a slice of Flickr reserved for images that are ‘in the commons‘. Effectively, this means there are “no known copyright restrictions” and the images can be enjoyed, used, and distributed in the public domain.
The Library of Congress, Smithsonian Institute and George Eastman House are among the participating institutions which make it an excellent resource for images of American social history.
Here are a couple of images that a commons search for ‘New Mexico’ returned. Click on each image to go to the Flickr page.
Jack Whinery, homesteader, and his family, Pie Town, New Mexico
Jim Norris, homesteader, Pie Town, New Mexico