Hello, I am doing research for 1915-1920 Portrait Studio Film Processing (& 120mm film for personal use at that time) Would anyone know and/or be able to direct me to a reference to learn 1. what equipment (studio camera?) and what film or plates a portrait studio would have used at that time 2. how their film/plates were developed (in studio? chemicals? light?) 3. how 120mm film was developed in that time period for personal use - using a kodak 3 special Any info for that time period would be helpful. Thank you!