- Ryan, G. W., W. A. Carothers, G. E. Moore, and H. T. Bhattacharyya. 1980. Attack: emergence ratio as an indicator 6f area southern pine beetle population trends and expected timber mortality in the Piedmont of Georgia. Pages 164-168 in F. M. Stephen, J. L. Searcy, and G. D. Hertel (eds.), Modeling southern pine beetle populations. United States Department of Agriculture, Forest Service, Southeast Area State and Private Forestry, Technical Bulletin 1630. 174 p.
- Ryan, R. B. 1959. Termination of diapause in the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae), as an aid to continuous laboratory rearing . Canadian Entomologist 91:520-525.
- Ryan, R. B. 1961a. A biological and developmental study of Coeloides brunneri Vier., a parasite of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk. Unpublished dissertation, Oregon State University, Corvallis. 184 p.
- Ryan, R. B. 1961b. A biological and developmental study of Coeloides brunneri Vier., a parasite of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk. Dissertation Abstracts 22(4):1308-1309.
- Ryan, R. B. 1962a. A device for measuring the oviposition potential of a bark beetle parasite . Canadian Entomologist 94:737-738.
- Ryan, R. B. 1962b. Durations of the immature stadia of Coeloides brunneri (Hymenoptera: Braconidae) at various constant temperatures, with descriptions of the five larval instars . Entomological Society of America, Annals 55:403-409.
- Ryan, R. B. 1963. Contribution to the embryology of Coeloides brunneri (Hymenoptera: Baraconidae) . Entomological Society of America, Annals 56:639-648.
- Ryan, R. B. 1965. Maternal influence on diapause in a parasitic insect, Coeloides brunneri Vier (Hymenoptera: Braconidae). Journal of Insect Physiology 11:1331-1336.
- Ryan, R. B., and J. A. Rudinsky. 1962. Biology and habits of the Douglas-fir beetle parasite, Coeloides brunneri Viereck (Hymenoptera: Braconidae) in western Oregon . Canadian Entomologist 94748-763,.
- Twardus, D. B., G. D. Hertel, and G. W. Ryan. 1978. Southern pine beetle infestation, growth, and decline, 1977. United States Department of Agriculture, Forest Service, Southern Region, Forest Pest Management, Report 78-2-8.
- Miller, R. H., A. A. Berryman, and C. A. Ryan. 1986. Biotic elicitors of defense reactions in lodgepole pine . Phytochemistry 25:611-612.
- Nettleton, W. A., M. D. Connor, and G. W. Ryan. 1985. Evaluation and application of the TAMBEETLE and Arkansas southern pine beetle spot growth models in the Gulf Coastal Plain. Pages 202-205 in S. J. Branham and R. C. Thatcher, Symposium proceedings: Integrated pest management research. United States Department of Agriculture, Forest Service, Southern Forest Experiment Station, New Orleans, Louisiana, General Technical Report SO-56. 383 p.
- Ward, J. D., C. W. Dull, G. W. Ryan, and M. C. Remion. 1985. Estimating southern pine beetle caused timber losses over extensive areas. Pages 34-40 in S. J. Branham and R. C. Thatcher, Symposium proceedings: Integrated pest management research. United States Department of Agriculture, Forest Service, Southern Forest Experiment Station, New Orleans, Louisiana, General Technical Report SO-56. 383 p.
- Ammon, G., and K. Ryan. 1991. Insect infestation of fire-injured trees in the Greater Yellowstone area. United States Department of Agriculture, Forest Service, Intermountain Research Station (Ogden, UT), Research Note INT-398.
- Ammon, G., and K. Ryan. 1994. Using pheromones to protect heatinjured lodgepole pine from mountain pine beetle infestation. United States Department of Agriculture, Forest Service, Intermountain Research Station (Ogden, UT), Research Note INT-419.
- Ryan, K., and G. Amman. 1996. Bark beetle activity and delayed tree mortality in the Greater Yellowstone area following the 1988 fires. Pages 151-158 In J.M. Greenlee (ed.), The ecological implications of fire in Greater Yellowstone. Proceedings of the Second Biennial Conference on the Greater Yellowstone Ecosystem, Yellowstone National Park, Wyoming, USA, 19-21 September, 1993. International Association of Wildland Fire, Fairfield, Washington (USA). 235 pp.