Autograph Letter Signed ("Ch. Darwin"), 2 p, 8vo (integral address leaf), 12 Upper Gower Street, Friday, [c. 1839-1842], to Thomas Green Esq. Some general browning, heavier to verso of address leaf, offset and lighter browning to recto of address leaf and verso of p 2, faint dampstain to inner margin. Matted, framed, and glazed in a double window mat.
Darwin Correspondence Project, "Letter no 524F," accessed on 5 November 2017, http://www.darwinproject.ac.uk/DCP-LETT-524F