[AMERICAN AUTHORS]. GARDNER, Erle Stanley (1889-1970). Autograph letter signed ("Erle"), to his secretary Jean Bethell, San Francisco, n.d. 1 page, 4to, on Maurice Western Hotel stationery, staple holes upper margin, creased. "I am walking...I'll be back in the hospital by 4:30 or less." -- HARTE, Bret (1836-1902). Autograph letter signed ("Bret Harte"), to Mr. Watt, Trewsbury, Cirencester, England, 12 August 1889. 1 1/4 pages, 8vo, bifolium, receipt stamp "Received 12 Aug 89 ans. 12.8.89" upper left corner of first page. Harte requests two copies of the "cheap editions" of Cressy. -- KILMER, Joyce (1886-1918). Autograph letter signed ("Joyce Kilmer"), to Miss Bates, New York, 5 May 1915. 1 page, 4to, on New York Times stationery, creased, a few pale stains, some slight marginal chipping, small clear mounting corners to blank area. Kilmer asks the recipient, an employee at D. Appleton & Co., to give photographs of Mr. Chambers to the bearer of the letter. -- RILEY, James Whitcomb (1849-1916). Autograph quotation signed ("James Whitcomb Riley"), Indianapolis, 24 May 1897. 1 page, oblong 12mo. In full: "God's hands on the helm and His breath in the sails." -- Together, 4 manuscripts.