"New Deal Programs: Selected Library of Congress Resources was created to serve as a starting point for research using Library of Congress collections of New Deal program materials." Includes links to numerous collections of digitized materials, including photos, posters, music, manuscripts and more. [more inside]
Almost 1700 Carnegie Libraries (wikipedia) were built in the US in the late 19th and early 20th centuries, from Pennsylvania to California, from Florida to Oregon, and almost every other single place in between . (Scotland, too!) Some of them are still in use as libraries. Others aren't. This person is trying to collect post cards of as many of them as possible.