Some cards from the pre-Internet pamphlet file have turned up in the scratch paper supply at the reference desk. We have lots of cards with subjects beginning with O and P. "Friendship: See Psychology, Applied" was so classic that I saved it to take home with me. I shall now refer to my friends as my "applied psychology experiments."
Then there are the cards that are showing their age:
Outer Space: see Astronautics; Satellites, Artificial; Space Flight to the Moon
Physics: See also: Cosmic Rays
You can make your own card catalog cards with the Card Catalog Generator (which is how I made the card above).