Here are two books written by IK Marvel (pseudonym of Donald Grant Mitchell) which have the same format. They undoubtedly belong to the same series but which one is unclear. Both books have 1893 on the title page. The question is whether they belong to the Altemus Library (Series #37) or the Famous Red and White Series (Series #85). Rational arguments can be made for their inclusion in any of the two series.
The books have the same spine as is seen in the Famous Red and White Series. But the two 1893 titles already in this series have been seen and have different covers.
The Altemus Library books with these titles have different covers. The characteristic of this series is that all the titles had different covers. But some titles did have more than one cover and it is possible that these titles fit into that category. I suspect that this is the case but I cannot prove it.