Here is another book which I am quite sure belongs to a series. I am just unsure which one.

The size of the book as well as the text is identical to the same title (The Man Without a Country) in the Altemus Library (Series # 38). The cover pattern is quite different though. There are also the same similarities with the books of the Wyncote Series (#198) but again the covers are different.

The Crestmont Series (#72) is also a possibility but I am unsure what those covers look like. Since the catalogue states that they have gilt edges however, it is unlikely this book belongs to that series because its edges are plain.

Until I see another book with this cover pattern, I will be unable to categorize it for sure.