Léonce ROSENBERG (1879-1947). L.A.S., June 25, 1919, to a lady; 1page in-4 on the letterhead of his Galerie L'Effort moderne. He will go to see "your recent works on my return from England, i.e. around July 12 or 13"... The letter is adorned on the left with a colored cubist band by Auguste Herbin, with a phrase printed as an epigraph. Enclosed: - Anatole Jakovski, Auguste Herbin (Paris, Éditions "Abstraction-Création", 1933; in-4, uncropped). - a ms note (4p. small in-4) sharply criticizing Mathias Morhardt and his book on Les Origines de la Guerre (1921).