Two calculators (Masking and Color Separation) and Six manuals (Basic Color for the Graphic Arts, The Dye Transfer Process, Camera-Back Silver Masking with three-aim-point-control, Kodak Professional Black-And-White Films, Photography and Layout for Production, Silver Masking of Transparencies with three-aim-point control). 

All show signs of use, like notes, underlining, evidence of tape. All are originals and not copies. All are Kodak.