That's pretty interesting. If your interested in the story behind the stations Jennifer of Radio Survivor has been personally visiting those college stations for years now and documenting their history
https://www.radiosurvivor.com/ Most of the history she's dug up is exclusive stuff that has never been documented before, going back to the 1940s - real interesting stuff. A lot of my own history research into part 15 - particularly the college stations I never would have found without her on-hands on-location research - I absolutely guarantee much of that info is exclusively available solely from her efforts. It's her digging that revealed that for well over a decade the FCC was actually officially reserving call letters for those part 15 carrier-current stations! That info is nowhere to be found in the FCCs official archives - it's totally absent, but the official FCC documents are available through the archives of the college stations themselves, Jenifer brought them all to light, and is still in the process of adding more - she's also the curriator of the DLARC section of the internet archive that now contains such documentations.