At this time I have recognized 152 different non series Altemus published books. Better than 95% of all Altemus books were published in series form.

Looking at the non series list (http://henryaltemus.com/nonseries.html) you can see that there are still a number of titles I have still not found.

These undiscovered books are not necessarily valuable but they are certainly quite scarce. Here is a newly found non series book.

This 141 page book of Poems was published in 1902. It is 7 x 4.75.
This book was published previously in the Devotional Series.

Altemus did not publish the first edition of this title.

The author, Isaiah Mench Chambers (1865-1933), was born in Pennsylvania and went to Lafayette College. He was a Presbyterian minister in addition to being a lecturer and author.