These collections bring together millions of items ranging from manuscripts to photographs, from books to film. The collections are strongest in pre-1925 material due to copyright considerations.
Adapted: RUSA https://rusahistory.libguides.com/unitedstates#s-lg-box-17013541
The Reference and User Services Association (RUSA) is a network to educate, empower, and inspire its members to advance the evolution of the profession and better serve users in a continuously changing information society.
RUSA is a division of the American Library Association. RUSA serves all types of libraries in reference, user services, adult readers advisory and collection development as well as resource sharing, genealogy and archives, business reference and reference technology.
Adapted: http://www.ala.org/rusa/about