90 classic titles celebrating 90 years of Penguin Books Collecting two of his most celebrated works - Rescue , written in Warsaw in the shadow of Nazi occupation, and A Treatise on Poetry - a momentous history of Poland, told in four cantos - here lie the sharpest fruits of one of the greatest poets of the 20th century: the Nobel Laureate who narrates the rise and fall of nations, who 'voices man's exposed condition in a world of severe conflicts'.