Upton Sinclair, 'The Jungle,' a Signet Classic from New American Library, first published in 1905, I am unsure when this copy published, but most likely in the 1960s.
The Jungle is a 350 page paperback measuring 7" x 4". There are faint creases to the cover. Inside, the pages are tanning. The condition is good.
In some of the most harrowing scenes ever written in modern literature, Upton Sinclair vividly depicts factory life in Chicago in the first years of the twentieth century. The horrors of the slaughter houses, their barbarous working conditions...the crushing poverty, the disease, the depravity, the despair--he reveals all through the eyes of Jurgis Rudkus, a young immigrant who has come to the New World to build a home for himself, his fiancee, and her family. Published in 1906, The Jungle aroused the indignation of the public and forced a government investigation which led to the passage of the pure food laws. It also established its young author as a fearless crusader for the rights of the working man--one of the world's leading spokesmen for freedom, equality and humanity.