[fencepost]

Not necessarily and it depends a lot on what the materials were. IEEE publications were mentioned, it was founded in 1963 and there's a good chance that anything from the first 10 years may no longer be in archives unless donated back by a recipient.

[ghaff]

I'd probably have more faith that IEEE publications still existed somewhere in some form. But the vast majority of publications either don't exist at all or they exist only in physical form someplace and aren't readily accessible.