The foam is breaking down. The game itself is in great shape.
WFF Game of Modern Logic by Layman E. Allen 1965 Yale Vintage Dice WFF’n Proof
QUERIES N' THEORIES FROM WFF'N PROOF PUBLISHERS THE GAME OF SCIENCE & LANGUAGE
WFF 'N PROOF The Game of Modern Logic 1975 - Layman E. Allen
WFF'N PROOF ON-WORDS- Vintage Educational Game For Thinkers Tri Nim
ON-SETS The Game of Set Theory (1967 Wff'n Proof) -- Complete in Box
