String Trios Op. 3, 8, and 9 and String Duo WoO 32 by Ludwig van Beethoven (1770-1827). Edited by Emil Platen. For String Trio, String Duet. String Duo and Trios. Henle Music Folios. Pages: Vl Part = 61 * Va Part = 66 * Vc Part = 58. Softcover. 186 pages. G. Henle #HN192. Published by G. Henle (HL.51480192).