The layout of the score is definitely this one of the Max Reger Edition (Breitkopf & Härtel) edited by Hans Klotz, which was published some decades ago. However, THIS score layout is NO public domain!
This Trio is No.5 of op.47. I have uploaded the complete score (first print) of op.47. Perhaps you can move this file there and delete this page? --Kaun 16:27, 11 May 2007 (EDT)