The Vademecum Series covers in 1901, 1902, 1903 and 1907 had appliqués on the front covers that were European Paintings. The covers had vertical sections from a painting such that numerous different covers exist with parts of the same painting. So far more than 40 different covers have been seen (see http://henryaltemus.com/vademecum.htm for examples) but there are probably only 20 or so different paintings.

Here is an example

Looking closely you can see that these covers are all part of the same picture.