Type specimens of recent gastropoda in the University of Colorado Museum
The nest of Liometopum apiculatum Mayr Hymenoptera: Formicidae
Some noteworthy additions to the lichen flora of India and Nepal
Lichens of the Chiricahua Mountains, Arizona
Notes on a collection of herpetozoa from the Yucatan Peninsula of Mexico ; Reptiles -- Yucatán Peninsula
Ecosystems of the east slope of the Front Range in Colorado
Studies of Colorado bryophytes
Additions to the flora of Colorado - III
An annotated check list of the amphibians and reptiles of Colorado
The birds of El Paso County, Colorado