Books by Frederick H. Billings
Microsporogenesis in Phoradend
Microsporogenesis in Phoradendron
Results of the artificial use of the white-fungus disease in Kansas
Results of the artificial use of the white-fungus diseases in Kansas
Beiträge zur Kenntniss der Sam
Beiträge zur Kenntniss der Samenentwickelung
A study of Tillandsia usneoide
A study of Tillandsia usneoides