Organ Transcription by Clarence Eddy, this piece has little to do with Thanksgiving, but I couldn't ever resist the grand Romanticism of this work. Originally copyrighted in 1888, this score is in the public domain and attached below.
I made use of Hauptwerk's "Melody" coupler to bring the Tuba onto the Great for bringing out the melody in the middle sections, and it is a handy thing to have for orchestral transcriptions like this one.