OTD 1973: #UNIX seminar at Bell Labs. pdf: https://drive.google.com/file/d/1HAISQ_LTJTBRGtKbIsrsIAM54k8Zub22/view?usp=sharing
The stamp on the bottom “this copy for” reminds me of the routing slips with everyone’s name on it to route memos around to the team. If you forgot to check your name, it came back to you.