The thing that led me to this was the "Wilhelm Scream"[1]. Something recently made me think of that, and I wound up on Wikipedia or somewhere reading about it, and eventually found that the original "Wilhelm Scream" is part of this USC archive.

https://archive.org/details/SSE_Library_VOICES/SCREAM/VOXScr...

An interesting little piece of history, there.

[1]: https://en.wikipedia.org/wiki/Wilhelm_scream

I think it showed up in an ad somewhere recently and thats how it’s gotten on my radar recently.

This archive is especially a treasure. The sound effects library here is very comprehensive for its time. Foley artists and musicians can save themselves a ton of money by using this library instead of yet another rent-seeking cloud service that parcels out samples instead of allowing one to acquire them permanently and in bulk.