
Thank you.
It is, WWII, a wonderfully interesting area for which to collect patriotic covers. One book on the subject is, "United States Patriotic Covers of World War II" can be found without much effort. Of course if there was a war or other reason to be patriotic, there are covers to be found.
Now I use a laptop which I can set on edge to view your photos. However, it would be easier on your readers, well cover viewers, if you rotate your illustration 90 degrees before posting.
