36 books
The Butterfly Book
Memoirs of the Carnegie Museum, 1913-1914, Vol. 6 (Classic Reprint)
Annals of the Carnegie Museum, 1919, Vol. 12 (Classic Reprint)
Lepidoptera of the Congo
The osteology of Diplodocus Marsh
The Moth Book V5 the Moth Book V5
The Moth Book V5
The Butterfly Guide
The Moth Book; A Popular Guide to a Knowledge of the Moths of North America
Supplementary Metric Mathematics
Activity and Discovery in Mathematics
The Moth Book