LAURENCE, Abbott. Autograph letter signed ("Abbott Laurence"), as U.S. House Representative, 18 May 1836, to A. Lansing. 1p., 4to, old folds. -- LOUDON, John C. Autograph letter signed ("J.C. Loudon") to M.M. Otto, 5 June 1839. 3pp., 8vo, creases. -- ROWLAND, David. Autograph letter signed ("David Rowland"), 14 November 1865. 4pp., 8vo, tipped to album leaf. -- CAYLEY, Arthur. Autograph letter signed ("A. Cayley"), 10 December 1872. 1p., 8vo, old folds. -- ABBE, Cleveland. Autograph letter signed ("Cleveland Abbe"), 5 September 1873. 1p., 8vo, on lined paper, few creases and stains. -- MORTON, Henry. Autograph letter signed ("Henry Morton"), 25 September 1873. 1p., 8vo, on Stevens Institute of Technology letterhead, old folds. And 41 others. Together, approximately 50 works, primarily autograph letters signed and clipped signatures, with a few signed photographs and pamphlets, various dates spanning the 19th and 20th century, sheets 10 x 8 in. or smaller. Condition varies but is generally good.