Every year appaers the supplement United States sheets, this contains the sheets for the Leuchtturm preprint album.The sheets have SF mounts and an 13 ring perforation for the Leuchtturm ring binders.
Here you can store the sheets issued in the previous year.
On all sheets there are frames where you can put the sheets, usually with a picture of the sheet itself. On all these frames are transparent mounts to safely place your sheets in.
The supplement United States sheets contains the year 2019.
The content consists of 5 pages.