The Penguin Problems Book by W. T. Williams and G. H. Savage
Penguin first number 260. Published March 1940. Rear cover advert: Army Club (cigarettes).
Covers grubby and spine darkening. Fronn cover has two creases, one full length and one half length.
Pages have some age tanning and edges are a bit grubby.
The photographs form part of this description.