The Medical Heritage Library (MHL) is a digital curation collaborative among some of the world’s leading medical libraries, promoting free and open access to quality historical resources in medicine. Contributors include The Cushing/Whitney Medical Library at Yale University, The Francis A. Countway Library of Medicine at Harvard University and the U.S. National Library of Medicine. They are a significant contributor to the Internet Archive, and though not all digitisations are free from rights, many are. (Wikipedia)