This directory is an encyclopedic compilation and includes all companies, institutions, and organizations which lend or rent 16mm films within the United States--including the 48 States, the District of Columbia, Alaska, Hawaii, and Puerto Rico--and assented to their being listed in the directory. It includes libraries which handle entertainment films and those which handle instructional films. A query, in the form of a letter-questionnaire, was sent to 4,920 known or possible 16mm film libraries in January and March 1958, of which 3,660 responded that they were, in fact, 16mm film libraries and agreed to their inclusion in the directory. The listing is arranged alphabetically by state, city, and library name. The annotation of each library contains three items of basic information: (1) The number of films (titles) in the library; (2) the nature of these films, namely entertainment, educational, religious, or sponsored; and (3) special restrictions, if any, on the distribution and use of these films, such as geographical limitations or restrictions required by law. [Best copy available has been provided.].