Dewey Decimal 501 shows up a lot when I analyze my writings – which is:
Natural sciences and mathematics > General Science > Philosophy and theory
So I looked LibraryThing’s list of books under 501 and one jumped out immediately as an interest of mine, which I’m going to find and read now:
Sorting Things Out
Classification and Its Consequences
By Geoffrey C. Bowker and Susan Leigh Star
MIT Press 1999.