- Frye, R. H., and T. D. Landis. 1975. Mountain pine beetle and dwarf mistletoe, Lake Creek Area, San Carlos Ranger District, Pike and San Isabel National Forests. United States Department of Agriculture, Forest Service, Rocky Mountain Region, State and Private Forestry, Report R2-75-4. 10 p.
- Landis, T. D., R. Averill, and R. H. Frye. 1977. Central Rocky Mountains (R-2). Pages 28-33 in H. V. Toko and T. J. Rogers, Forest insect and disease conditions in the United States, 1974. United States Department of Agriculture, Forest Service. vi + 55 p.
- Landis, T. D., and R. H. Frye. 1974. Tree injury and mortality in the Dillon-Keystone area, Dillon Ranger District, White River National Forest. United States Department of Agriculture, Forest Service, Rocky Mountain Region, Report R2-74-16. 7 p.
- Landis, T. D., and L. R. Helburg. 1976. Black stain root disease of pinyon pine in Colorado . Plant Disease Reporter 60:713-717.