Edited by Ingo Gronefeld & Friedrich Grunke. For 2 flutes and basso continuo. Six trio sonatas in two volumes. Based on the parts printed by J. J. Hummel, Amsterdam, 1771. The Breitkopf catalog of 1776 attributed these trios to Friedrich's brother, Christian Ernst Graf. Volume 1 contains: Trio No. 1 in D; No. 2 in G; and No. 3 in C. Volume 2 contains: Trio No. 4 in E minor; No. 5 in F; and No. 6 in D. Score & Parts.