“Did you read Oath of Fealty?”
I’m pretty sure I’ve read it and that I’ve seen a copy of it around here, but I don’t specifically remember it. I won’t say I’ve read all of Niven’s writing, but I’ve read a lot of it over the years. My paperback copy of “Ringworld” has a price of 95 cents from when I bought it new.
And then there’s the fact that I’ve been known to buy multiple copies of something, not remembering that I’ve read it till I get started on the new copy :)
O of F was Niven/Pournelle.