The collection of late nineteenth and early twentieth century photographs of Chicago and some neighboring towns, most of which presumably were taken by Sloan, consists of shots of churches, houses, schools, libraries, civic and commercial buildings, monuments and statuary. Most of this material is undated. Also includes a group of aerial views of the city and some suburban land, taken between 1925 and 1930 by the Chicago Aerial Survey Co. Sloan’s checklists of his work indicate he was particularly interested in Chicago churches and in various architectural styles, and includes an inventory of negatives sold to the Art Institute.