This is a late reply, but I'd check out Unix: A History and Memoir by Brian Kernighan. It came out late 2019 and it was his recount of what Bell Labs and Unix w

This is a late reply, but I'd check out Unix: A History and Memoir by Brian Kernighan. It came out late 2019 and it was his recount of what Bell Labs and Unix was like in the early days. So much neat history there - I highly recommend that book.