- Hopping, G. R., and J. H. Jenkins. 1933. The effect of kiln temperatures and air-seasoning on ambrosia insects (pinworms). 14 p., 6 figs.
- Hopping, G. R. 1922. Coniferous hosts of the Ipidae of the Pacific Coast and Rocky Mountain regions. Canadian Entomologist 54:128-134.
- Hopping, R. 1915. The Entmological aspect of slash disposal. 10:183-185.
- Hopping, G. R. 1965e. The North American species in Group IX of Ips DeGreer (Coleoptera: Scolytidae) . Canadian Entomologist 97:422-434.
- Hopping, G. R. 1965c. The North American species in Group VII of Ips DeGreer (Coleoptera: Scolytidae) . Canadian Entomologist 97:193-198.
- Hopping, G. R. 1963c. The natural groups of species in the genus Ips DeGreer (Coleoptera: Scolytidae) in North America . Canadian Entomologist 95:508-516.
- Hopping, G. R. 1921. The control of barkbeetle outbreaks in British Columbia. Canada Department of Agriculture, Entomology Branch, Circular 15.
- Hopping, G. R. 1932. Control of Douglas-fir bark beetles . Timberman 33:61.
- Hopping, G. R. 1942. Apparent negative geotropism in the Douglas fir bark beetle . Canadian Entomologist 74:205.
- Hopping, G. R. 1943. Bark beetle brood development in Kootenay National Park, 1942. Canada Department of Agriculture, Pacific Forest Research Centre, Victoria, British Columbia, Report for 1942:43-75 (mimeographed).
- Hopping, G. R. 1946a. Bark beetle control . Canada Department of Agriculture, Forest Biology Division, Science Service, Bi-monthly Progress Report 3:3.
- Hopping, G. R. 1946b. Control of the more injurious bark beetles of the Canadian Rocky Mountain region. Canada Department of Agriculture, Division of Entomology, Science Service, Processed Publication No. 47. 7 p.
- Hopping, G. R. 1946c. Control of the more injurious bark beetles of the Canadian Rocky Mountain region. Canada Department of Agriculture, Division of Entomology, Science Service, Processed Publication No. 49. 7 p.
- Hopping, G. R. 1946d. Control of the more injurious bark beetles of the Canadian Rocky Mountain region . Ontario Entomological Society, Annual Report 81:72-75.
- Hopping, G. R. 1947a. Forest insect laboratory at Vernon responsible for control in huge area . British Columbia Lumberman 31112, 114.
- Hopping, G. R. 1947b. Notes on the seasonal development of Medetera aldrichii Wheeler (Diptera, Dolichopodidae) as a predator of the Douglas fir bark-beetle, Dendroctonus pseudotsugae Hopkins . Canadian Entomologist 79:150-153.
- Hopping, G. R. 1948. Bark-beetles . Canada Department of Agriculture, Entomology Division, Bi-monthly Progress Report 4:3.
- Hopping, G. R. 1950a. Bark beetles in Rocky Mountain region . Canada Department of Agriculture, Entomology Division, Bi-monthly Progress Report 6:3.
- Hopping, G. R. 1950b. Observations on outbreaks and control of the mountain pine beetle in the lodgepole pine stands of western Canada . Forestry Chronicle 21/ 2:1-11.
- Hopping, G. R. 1950c. Timber types in relation to insect outbreaks in the Canadian Rocky Mountains . Ontario Entomological Society, Annual Report 81:72-75.
- Hopping, G. R. 1951. Forest entomology in relation to silviculture in Canada. Part V. The mountain pine beetle. Forestry Chronicle 27:24-32.
- Hopping, G. R. 1952. Bark beetles . Canada Department of Agriculture, Forest Biology Division, Bi-monthly Progress Report 8:3.
- Hopping, G. R. 1960a. A new species of Pityophthorus Eichhoff (Coleoptera: Scolytidae) from Alberta . Canadian Entomologist 92:865-867.
- Hopping, G. R. 1960b. Forest and shade-tree pests. Larch. A bark beetle (Pityophthorus alpinensis Hopp.). Canadian Insect Pest Review 38:258.
- Hopping, G. R. 1961a. Insects injurious to lodgepole pine in the Canadian Rocky Mountain region in lodgepole pine in Alberta . Canada Department of Forestry, Bulletin 127:77-87.
- Hopping, G. R. 1961b. Techniques for rearing Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 93:1050-1053.
- Hopping, G. R. 1962a. Biotaxonomic studies of Scolytidae . Canada Department of Forestry, Forest Entomology and Pathology Branch, Annual Report 1962:114.
- Hopping, G. R. 1962b. The sex ratios in Ips tridens Mannerheim (Coleoptera: Scolytidae) . Canadian Entomologist 94:506.
- Hopping, G. R. 1963a. Biotaxonomic studies of Scolytidae . Canada Department of Forestry, Forest Entomology and Pathology Branch, Annual Report 1963:116.
- Hopping, G. R. 1963b. Generic characters in the tribe Ipini (Coleoptera: Scolytidae), with a new species, a new combination, and new synonymy . Canadian Entomologist 95:61-68.
- Hopping, G. R. 1963d. The North American species in Group I of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 95:1091-1096.
- Hopping, G. R. 1963e. The North American species in Groups II and HI of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 95:1202-1210.
- Hopping, G. R. 1963f. Two new species of Ips DeGeer (Coleoptera: Scolytidae) from western Canada and Alaska . Canadian Entomologist 95:213-217.
- Hopping, G. R. 1964a. The breeding evidence indicating two genetic types of females of Ips tridens (Mannerheim) (Coleoptera: Scolytidae) . Canadian Entomologist 96:117-118.
- Hopping, G. R. 1964b. The North American species in Groups IV and V of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 96:970-978.
- Hopping, G. R. 1965a. Biotaxonomic studies of Scolytidae . Canada Department of Forestry, Forest Entomology and Pathology Branch, Annual Report 1965:127.
- Hopping, G. R. 1965b. The North American species in Group VI of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 97:533-541.
- Hopping, G. R. 1965d. The North American species in Group VIII of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 97:159-172.
- Hopping, G. R. 1965f. The North American species in Group X of Ips DeGeer (Coleoptera: Scolytidae) . Canadian Entomologist 97:803-809.
- Hopping, G. R., and G. Beall. 1948. The relation of diameter of lodgepole pine to incidence of attack by the bark beetle Dendroctonus monticolae Hopkins . Forestry Chronicle 24:141-145.
- Hopping, G. R., and W. G. Mathers. 1945. Observations on outbreaks and control of the mountain pine beetle in the lodgepole pine stands of western Canada . Forestry Chronicle 21:98-108.
- Hopping, R. 1921. The control of bark-beetle outbreaks in British Columbia. Canada Department of Agriculture, Entomological Branch, Circular 15. 15 p., 13 figs.
- Hopping, R. 1922. Coniferous hosts of the Ipidae of the Pacific Coast and Rocky Mountain regions . Canadian Entomologist 54:128-134.
- Hopping, R. 1924a. Insect situation of British Columbia and United States . Lumber World Review 47:43.
- Hopping, R. 1924b. Yellow pine (Pinus ponderosa) as a host in British Columbia . Canadian Entomologist 56:125-128.
- Hopping, R. 1925a. Juniperus scopulorum as a host . Canadian Entomologist 57:105-106.
- Hopping, R. 1925b. Relation between abnormality and insect attacks in western yellow and Jeffrey pine stands . Journal of Forestry 23:932-935.
- Hopping, R. 1928a. Influence of slash on bark beetle outbreaks. For. Congr. Can. Soc. For. Eng. 4:15-21.
- Hopping, R. 1928b. Influence of slash on bark beetle outbreaks . Forestry Chronicle 4:1-7.
- Hopping, R. 1934. The chief forest insect problems of the Pacific coast of North America . Pacific Science Congress (Canada), Proceedings 5:3385-3386.
- Hopping, R. 1939. A new species of Ips (Coleoptera, Scolytidae) . Canadian Entomologist 71:168-169.