Highly important German philosopher, political theorist, and author (1818–1883) whose Communist Manifesto (1848) and Das Kapital (published 1867–1894) provided an ideological basis for communism and thus proved to be two of the most influential texts in the history of modern civilization. Rare ALS in English, one page, 4.5 x 7, October 1, 1879. Marx writes from 41 Maitland Park Road, London, his residence from 1875 until his death, to L.[?] D. Collet, Esq. In full: “On my return from the seaside I found your letter d[ate]d 23 September. You will much oblige me by being so kind as to forward me some of the copies of the ‘Revelations,’ as I have none left.” Marx was a close friend of the Collet family, which included pioneering feminist activist Clara Collet and C. D. Collet, editor of The Free Press: A Diplomatic Review, to which Marx contributed a number of articles. The publication to which Marx evidently alludes, “Revelations of the Diplomatic History of the 18th Century,” was originally serialized in the Free Press from August 1856 to April 1857. In very good, attractive condition overall, with intersecting folds, moderate wrinkling, and a few creases. The sheet is bright, the writing dark, precise, and easily legible despite Marx’s distinctive tiny hand. Auction LOA John Reznikoff/PSA/DNA and R&R COA.