As I have mentioned a number of times, most Altemus books were published in series form. Every now and then however the series cannot be determined. There are two reasons for this. First, the catalogues don’t show the particular format to which the book belongs. The second reason is that the series to which the book(s) belongs is just not noted in any of the catalogues.

An example of the latter is the Christmas Gift Series (#64) which is not listed anywhere.

In order to be certain of a series name to which a book in these categories belongs to you have to find the book in a dust jacket or a box. The jacket or box is generally labeled.

Presently I have seen three books with the cover below. These books have soft embossed leather covers.
1. Fanchon the Cricket
2. Tartarin on the Alps
3. Rubaiyat of Omar Khayyam

Fanchon was published by Henry Altemus (pre-1900) whereas Tartarin was published by Henry Altemus Company (1900 or later).

Only five series include all three of these titles:
#48 Beauxarts Series
#118 L’Art Nouveau Series
#130 Marqueterie Series
#143 Petit Trianon Series
#180 Vademecum Series

So these books either belong to one of the above series or a series which has yet to be discovered.