I have designed what I think constitutes a basic grouping of this series. These 48 pages would fit completely in a 24-page double-side presentation book. The collection consists of 320 items. For this exercise I will consider all incoming material game for this collection. I have just received the first item.
Here is the scheme for the first half of the presentation book
Here is the scheme for the second half of the presentation book
Here is the cover. 1 down, 319 items to go.
The letter was postmarked April 25, 1936.
Here is a detail of one of the 1 peso stamps.