The Subject File series is comprised of Chandler's own extensive research files and are arranged alphabetically. Many of these files are directly related to chemical, legal, or public health problems that Chandler actively worked on in his career, but there are also many that reflect his general interests in science and technology, such as the files related to photography and photographic processes. A typical subject file may contain clippings and notes, published articles, advertisements, correspondence, and often legal proceedings or legal precedents. As a general rule these are materials collected but not authored by Chandler, exceptions to this will generally be noted. Many of the subject files also contain physical samples of the materials-- notably but certainly not exclusively in Chandler's large collection of dye samples.