Since yesterday I'm the owner of a Whitmal folder named "Westward series nickels", which is the very first folder I have. It comes with 10 nickels, all 4 designs, a P and a D of each. The last two are added for the obverse.
Then there's 16 more holes in which nickels can be put, but it doesn't say which.
(proofs maybe, but that's only 4 more....)