String Quartets Op. 18 and String Quartet Version of the Piano Sonata Op. 14 by Ludwig van Beethoven (1770-1827). Edited by Ernst Herttrich. For String Quartet. String Quartets. Henle Music Folios. Pages: Parts - Vl I = 67* Vl II = 59 * Va = 58 * Vc = 54. Softcover. 277 pages. G. Henle #HN139. Published by G. Henle (HL.51480139).