- Gara, R. I. 1963. Studies on the flight behavior of Ips confusus(Lec) (Coleptera: Scolytidae) in response to attractive material. 22:51-66.
- Gara, R. I. 1965. Studies on the flight behavior of Ips confusus (Lec) (Coleptera: Scolytidae) in response to attractants. 25:4891-4892.
- Gara, R. I., and J. P. Vite. 1962. Studies on the flight patterns of bark beetles (Coleoptera: Scolytidae) in second growth growth ponderosa pine forests. 21:275-290.
- Vite, J. P., and R. I. Gara. 1961. A field method for observation on olfactory responses of bark beetles (Scolytidae) to volatile materials. Boyce Thompson Institute for Plant Research, Contributions 21:175-182.
- Vite, J. P., and R. I. Gara. 1962. Volitile attractants from ponderosa pine attacked by bark beetles (Coleoptera: Scolytidae). Boyce Thompson Institute for Plant Research, Contributions 21:251-273.
- Vite, J. P., R. I. Gara, and R. A. Kliefoth. 1963. Collection and bioassay of a volatile fraction attractive to Ips confusus (LeC) (coleoptera: Scolytidae). Boyce Thompson Institute for Plant Research, Contributions 22:39-50.
- Coster, J. E., and R. I. Gara. 1968. Studies on the attack behavior of the southern pine beetle II Response to attractive host material . Boyce Thompson Institute for Plant Research, Contributions.
- Billings, R., Forrest, and R. I. Gara. 1975. Rhythmic emergence of Dendroctonus ponderosae (Coleoptera: Scolytidae) from two host species . Entomological Society of America, Annals 68:1033-1036.
- Billings, R. F., R. I. Gara, and B. F. Hrutfiord. 1976. Influence of ponderosa pine resin volatiles on the response of Dendroctonus ponderosae to synthetic trans-verbe-nal . Environmental Entomology 5:171-179.
- Cade, S. C., B. F. Hrutfiord, and R. I. Gara. 1970. Identification of a primary attractant for Gnathotrichus sulcatus isolated from western hemlock logs . Journal of Economic Entomology 63:1014-1015.
- Deyrup, M. A., and R. I. Gara. 1978. Insects associated with Scolytidae (Coleoptera) in western Washington . Pan-Pacific Entomologist 54:270-282.
- Gara, R. I. 1962. A field approach to study the flight behavior of bark beetle populations (Coleoptera: Scolytidae). Unpublished thesis, Oregon State University, Corvallis. 93 p.
- Gara, R. I. 1965a. Studies on the flight behavior of Ips confusus (Lec.) (Coleoptera: Scolytidae) in response to attractants. Unpublished dissertation, Oregon State University, Corvallis. 141 p.
- Gara, R. I. 1965b. Studies on the flight behavior of Ips confusus (Lec) (Coleoptera: Scolytidae) in response to attractants . Dissertation Abstracts 25:4891-4892.
- Gara, R. I. 1966a. Results of research conducted on the southern pine beetle . American Pulpwood Association, Technical Papers 1966:28-29.
- Gara, R. I. 1966b. What we have learned from new research on the southern pine beetle . Forest Farmer 256-7, 18-19.
- Gara, R. I. 1967a. A field olfactometer for studying the response of the southern pine beetle (Dendroctonus frontalis) to attractants . Journal of Economic Entomology 60:1180-1181.
- Gara, R. I. 1967b. Studies on the attack behavior of the southern pine beetle. I. The spreading and collapse of outbreaks. Boyce Thompson Institute for Plant Research, Contributions 23(10):349-354.
- Gara, R. I., and J. E. Coster. 1968. Studies on the attack behavior of the southern pine beetle. III. Sequence of tree infestation within stands. Boyce Thompson Institute for Plant Research, Contributions 24(4):77-86.
- Gara, R. I., R. D. Geiszler, and W. R. Littke. 1984. Primary attraction of the mountain pine beetle to lodgepole pine in Oregon . Entomological Society of America, Annals 77:333-334.
- Gara, R. I., and E. H. Holsten. 1975. Preliminary studies on arctic bark beetles (Coleoptera: Scolytidae) of the Noatak River drainage . Zeitschrift fur Angewandte Entomologie 78:248-254.
- Gara, R. I., and L. L. Jaeck. 1978. Insect pests of red alder: potential problems . United States Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, General Technical Report 70:265-269.
- Gara, R. I., W. R. Littke, J. K. Agee, D. R. Geiszler, J. D. Stuart, and C. H. Driver. 1985. Influence of fires, fungi and mountain pine beetles on development of a lodgepole pine forest in southcentral Oregon. Pages 153-162 in Lodgepole pine: the species and its management. Symposium proceedings, 8-10 May 1984, Spokane, Washington.
- Gara, R. I., and V. A. Samaniego. 1970. No. 11243, Studies on flight and host selection behavior of Xyleborus spp. and Platypus spp. (Coleoptera: Scolytidae and Platypodidae). Report of forest entomology consultant (Latin America). UNDP/SF project LAT/REG/8. Interamerican Institute of Agricultural Sciences, Turrialba. 103 p.
- Gara, R. I., J. P. Vite, and H. H. Cramer. 1965. Manipulation of Dendroctonus frontalis by use of a population aggregating pheromone . Boyce Thompson Institute for Plant Research, Contributions 23:55-66.
- Gaumer, G. C., and R. I. Gara. 1967. Effects of phloem temperature and moisture content on development of the southern pine beetle . Boyce Thompson Institute for Plant Research, Contributions 23:373-378.
- Geiszler, D. R., V. F. Gallucci, and R. I. Gara. 1980. Modeling the dynamics of mountain pine beetle aggregation in a lodgepole pine stand . Oecologia 46:244-253.
- Geiszler, D. R., and R. I. Gara. 1978. Mountain pine beetle attack dynamics in lodgepole pine. Pages 182-187 in A. A. Berryman, G. D. Amman, R. W. Stark, and D. L. Kibbee (eds.), Theory and practice of mountain pine beetle management in lodgepole pine forests, Symposium, 25-27 April, Pullman, Washington. University of Idaho, College of Forest Resources. 220 p.
- Geiszler, D. R., R. I. Gara, C. H. Driver, V. F. Gallucci, and R. E. Martin. 1980. Fire, fungi, and beetle influences on a lodgepole pine ecosystem of south-central Oregon . Oecologia 46:239-243.
- Geiszler, D. R., R. I. Gara, and W. R. Littke. 1984. Bark beetle infestations of lodgepole pine following a fire in south central Oregon . Zeitschrift fur Angewandte Entomologie 98:389-394.
- Gray, B., R. F. Billings, R. I. Gara, and R. L. Johnsey. 1972. On the emergence and initial flight behavior of the mountain pine beetle Dendroctonus ponderosae in eastern Washington . Zeitschrift fur Angewandte Entomologie 71:250-259.
- Hedden, R. L., and R. I. Gara. 1976. Spatial attack pattern of a western Washington Douglasfir beetle population . Forest Science 22:100-102.
- Pitman, G. B., R. L. Hedden, and R. I. Gara. 1975. Synergistic effects of ethyl alcohol on the aggregation of Dendroctonus pseudotsugae (Col, Scolytidae) in response to pheromones . Zeitschrift fur Angewandte Entomologie 78:203-208.
- Samaniego, V. A., and R. I. Gara. 1970. Estudios sobre la actividad de vuelo y seleccion de huespedes por Xyleborus spp. y Platypus spp. (Coleoptera, Scolytidae y Platypodidae). Turrialba 20: 471-477.
- Seybert, J. P., and R. I. Gara. 1970. Notes on flight and host-selection behavior of the pine engraver, Ips pini (Coleoptera: Scolytidae) . Entomological Society of America, Annals 63:947-950.
- Stuart, J. D., D. R. Geiszler, R. I. Gara, and J. K. Agee. 1983. Mountain pine beetle scarring of lodgepole pine in south-central Oregon . Forest Ecology and Management 5:207-214.
- Vite, J. P., R. I. Gara, and R. A. Kliefoth. 1963. Collection and bioassay of a volatile fraction attractive to Ips confusus (LeC) (Coleoptera: Scolytidae) . Boyce Thompson Institute for Plant Research, Contributions 22:39-50.
- Vite, J. P., R. I. Gara, and H. E. v. Scheller. 1964. Field observations on the response to attractants of bark beetles infesting southern pines . Boyce Thompson Institute for Plant Research, Contributions 22:461-470.
- Ashiru, M. O., and R. I. Gara. 1981. Towards an improved fat extraction technique in the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk . West African Science Association, Journal 26:29-39.
- Gara, R. I. 1988. Interactions between fires, fungi, mountain pine beetles, and lodgepole pine in southcentral Oregon . Northwest Environmental Journal 4:355-358.
- Gara, R. I., J. K. Agee, W. R. Littke, and D. R. Geisler. 1986. Fire wounds and beetle scars . Journal of Forestry 84:47-50.
- Gara, R. I., W. R. Littke, J. K. Agee, D. R. Geiszler, J. D. Stuart, and C. H. Driver. 1985. Influence of fires, fungi and mountain pine beetle on development of a lodgepole pine forest in southcentral Oregon. Pages 153-162 in D. M. Baumgartner et al., Lodgepole pine: the species and its management. Symposium proceedings, Cooperative Extension, Washington State University, Pullman, Washington.
- Vite, J. P., R. I. Gara, and H. D. v. Scheller. 1985. Southern pine beetle: enhancement or inhibition of aggregation response mediated by entiomers of endo-brevicomin . Naturwissenschaften 72:99.
- Gara, R., L. Cerda, and M. Donoso. 1980. Manual de entomología forestal. Fac. Ing. Forestal, U. Austral, Chile.
- Gara, R., W. Littke, and D. Rhoades. 1993. Emmission of ethanol and monoterpenes by fungal infected lodgepole pine trees . Photochemistry 34:987-990.
- Gara, R., C. Oliver, and R. Kenady. 1982. Insect pests of true firs in the Pacific Northwest. Contribution of the Institute of Forest Resources. University of Washington, Seattle 45:157-160.
- Stuart, J., J. Agee, and R. Gara. 1989. Lodgepole pine regeneration in an old, self-perpetuating forest in south central Oregon . Canadian Journal of Forest Research 19:1096-1104.
- Gara, R., D. Millegan, and K. Gibson. 1999. Integrated pest management of Ips pini (Col, Scolytidae) populations in south-central Montana . Journal of Applied Entomology 123:529-534.
- Gara, R., R. Werner, M. Whitmore, and E. Holsten. 1995. Arthropod associates of the spruce beetle Dendroctonus rufipennis (Kirby) (Col, Scolytidae) in spruce stands of south- central and interior Alaska . Journal of Applied Entomology 119:585-590.
- Wilson, J., E. Isaac, and R. Gara. 1998. Impacts of mountain pine beetle (Dendroctonus ponderosae) (Col, Scolytidae) infestation on future landscape susceptibility to the western spruce budworm (Choristoneura occidentalis) (Lep, Torticidae) in north central Washington . Journal of Applied Entomology 122:239-245.