Black and white. Typed description read: "PDP-11 Data System in use at the 42" reflecting telescope of the Lowell Observatory. Dr. Rudolf Albrecht (at the keyboard) on leave from the University of Vienna and Dr. Peter Boyce developed the system for use in conjunction with new rapid scanning techniques being used at the observatory to analyze the light from stars and planets." "For Further Information: Stephen A. Kallis, Jr; (617) 897-5111 ext. 2777". Also written in black ink on paper "Early 1970s"