Page 7-24 in TI 1971 set: http://bitsavers.trailing-edge.com/pdf/ti/_dataBooks/1971_TI_IntegratedCirc… Expander gates will be about as clear as mud in the modern logic diagram sense if you look at a single chip. Make sure to look up the 74H60 or 74H62 which is the "other half". There was an early 70's TI TTL book (not so much databook but more of a cookbook/how-to book) aimed towards college students or guys new to TTL that illustrated expander gates in useful ways. By the 80's there are still pages in the TI databooks for the expander gates but you'd be stumped trying to decode them.