Perhaps the earliest single source which tried to bring together information on the film industry is The Kinematograph Year Book, Program Diary and Directory for 1914. The directory gives an overview of the previous year (1913) and contains a wide range of articles and information (see contents list below). Also present are many advertisements, not only for films and film companies but also suppliers and service providers. It also contains a directory of all cinemas in the UK at the time.
Link to source