[samibe]

These are the Color Albums of Twenty Pieces for the Organ.
I'm planning on adding each volume as a separate post in this thread.
The volumes that I know of are:
1. Red
2. Blue
3. Green
4. Yellow
5. Brown
6. Golden
7. Gray
8. Silver
9. Orange
10. Purple
11. Buff
12. Black

PDFs of several of these are available on IMSLP.

[samibe]

CSVFile for "Red Album of Twenty Pieces for the Organ" or "Red Album of 20 Pieces for the Organ"

  Red Album of Twenty Pieces for the Organ.csv (Size: 4.73 KB / Downloads: 0)

[samibe]

CSVFiles for  "Blue Album of Twenty Pieces for the Organ" or "Blue Album of 20 Pieces for the Organ"

  Blue Album of Twenty Pieces for the Organ.csv (Size: 4.74 KB / Downloads: 0)

[samibe]

CSVFiles for "Green Album of Twenty Pieces for the Organ" or "Green Album of 20 Pieces for the Organ"

  Green Album of Twenty Pieces for the Organ.csv (Size: 4.59 KB / Downloads: 0)

[samibe]

CSVFiles for "Black Album of Twenty Pieces for the Organ" or "Black Album of 20 Pieces for the Organ"

  Black Album of Twenty Pieces for the Organ.csv (Size: 5.38 KB / Downloads: 0)