On a shelf of old mysterious problems, I found four cardboard boxes of catalog cards. These were the shelf list and catalog for the sound recordings (on records and audio cassettes) in our media collection. I blew the dust off of the cards and packed them neatly into drawers in a nearby card catalog cabinet, which houses cards for similar collections.
Those cards poking up out of the right drawer are “see also” cards, like this one:
They are housed in plastic sleeves that make them stand up above the other cards.