String Quartets Op. 18 and String Quartet Version of the Piano Sonata Op. 14 (Study Score). By Ludwig van Beethoven (1770-1827). Edited by Ernst Herttrich. For String Quartet (Study Score). STUDY EDITION. Henle Study Scores. Pages: VI and 161. Softcover. 170 pages. G. Henle #HN9139. Published by G. Henle (HL.51489139).