Over the years, as I used to read various Oracle white papers I observed two things.
1) They were often PDFs prefixed with the acronym “twp”, which I assume (without confirmation) stands for “technical white paper”
2) They were often hard to find more than once
Typically I hence would either bookmark them, or download them, which simply ended up shifting the “find the file” problem to my own PC with its shambles of file organisation.
So I bit the bullet and tried to catalog the white papers (now we call them “technical briefs”) here on the blog mainly so that I can find them again, but hopefully this page might help you as well.