Langdon’s List of 19th & Early 20th Century Photographers (archive.org Link)

This site ceased operations in 2023, the link below goes to a working version of the site from archive.org. This site provides information about photographers active in the United States from 1844 to 1950. The information comes from city directories, business and industry directories, classified advertising, tax lists, census, published sources and photographer’s marks on the images themselves.