Salt prints found in Harvard’s libraries, archives, and museums reveal the technical and artistic abilities of a broad range of photographers who were experimenting with and refining this early photographic process. Houghton Library, for example, holds a wealth of rare materials illustrating advances by early practitioners. The holdings include work by William Henry Fox Talbot and images by Talbot’s British contemporaries. Harvard’s collections also chronicle technological advances in the medium that transformed Talbot's invention into a process practiced by commercial photographers worldwide.