Influential Pulitzer Prize–winning American author (1878–1968) of such muckraking classics The Jungle, Boston, and Oil! ALS, one page, 6.25 x 8, May 3, 1961. Sinclair writes to Mr. Rische. In full: “A phone call from my brother-in-law in Phoenix tells me that you—or someone in your office—has asked for a copy of ‘Southern Belle.’ I am sending it by airmail, & enclose my circular about it….” Stapled to the letter is the circular Sinclair mentions, offering free copies of the book (written by his then-recently deceased wife) to libraries. In very good condition, with wrinkling, faint toning, and a few edge tears (just touching a few words of text). R&R COA.