- Frye, R. H., and N. D. Wygant. 1971. Spruce beetle mortality in cacodylic acid-treated Engelmann spruce trap trees . Journal of Economic Entomology 64:911-916.
- Germain, C. J., and N. D. Wygant. 1967. A cylindrical screen cage for rearing bark beetles. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Research Note RM-87. 4 p.
- Houseweart, M. W., and N. D. Wygant. 1971. Contact toxicity of lindane, landrin, and gardona to the mountain pine beetle . Journal of Economic Entomology 64:1575-1576.
- Massey, C. L., R. D. Chisholm, and N. D. Wygant. 1952. Ethylene dibromide for control of Black Hills beetle . Journal of Economic Entomology 45:861-862.
- Massey, C. L., R. D. Chisholm, and N. D. Wygant. 1953a. Chemical control of the Engelmann spruce beetle in Colorado . Journal of Economic Entomology 46:951-955.
- Massey, C. L., R. D. Chisholm, and N. D. Wygant. 1953b. Ethylene dibromide for control of Black Hills beetle . Journal of Economic Entomology 46:601-604.
- Massey, C. L., and N. D. Wygant. 1949. An analysis of seasonal precipitation records as related to Black Hills beetle outbreaks. United States Department of Agriculture, Bureau of Entomology and Plant Quarantine, Fort Collins, Colorado. 7 p.
- Massey, C. L., and N. D. Wygant. 1954. Biology and control of the Engelmann spruce beetle in Colorado. United States Department of Agriculture, Forest Service, Circular 944. 35 p.
- Massey, C. L., and N. D. Wygant. 1973. Woodpeckers: most important predators of the spruce beetle . Colorado Field Ornithologist 16:4-8.
- Massey, C. L., N. D. Wygant, and R. I. Washburn. 1950. Tests with ethylene dibromide emulsions for control of the Black Hills beetle in ponderosa pine. United States Department of Agriculture, Bureau of Entomology and Plant Quarantine, Fort Collins, Colorado.
- Miller, J. M., and N. D. Wygant. 1942. Studies of physical characteristics of high and low risk ponderosa pines, Black's Mountain Experimental Forest, season of 1941. United States Department of Agriculture, Bureau of Entomology, Berkeley, California. 19 p.
- Wygant, N. D. 1938. Critical low temperatures for the Black Hills beetle, 1937-1938. United States Department of Agriculture, Bureau of Entomology, Fort Collins, Colorado.
- Wygant, N. D. 1940. Effects of low temperature on the Black Hills beetle (Dendroctonus ponderosae Hopk.). Unpublished dissertation, New York State University, Syracuse. 57 p.
- Wygant, N. D. 1942a. Effects of low temperature on the Black Hills beetle (Dendroctonus ponderosae Hopk.). United States Department of Agriculture, Bureau of Entomology, Fort Collins, Colorado.
- Wygant, N. D. 1942b. Studies of physical characteristics of high and low risk ponderosa pines, Black's Mountain Experimental Forest, season of 1941. United States Department of Agriculture, Bureau of Entomology, Berkeley, California.
- Wygant, N. D. 1942c. Summary of a fall test with penetrating oil for control of mountain pine beetle in lodgepole pine—Wasatch National Forest, 1942. United States Department of Agriculture, Bureau of Entomology, Fort Collins, Colorado.
- Wygant, N. D. 1942d. Test with various amounts of orthodichlorobenzene in diesel oil for control of the mountain pine beetle—Wasatch National Forest, 1942. United States Department of Agriculture, Bureau of Entomology, Fort Collins, Colorado.
- Wygant, N. D. 1953. Ethylene dibromide for control of Black Hills beetle . Journal of Economic Entomology 46:601-604.
- Wygant, N. D. 1958. Engelmann spruce beetle control in Colorado . International Congress of Entomology, Proceedings 10:181-184.
- Wygant, N. D. 1959. Bark beetle control . Journal of Forestry 57:274-277.
- Wygant, N. D., and R. R. Lara. 1967. Pine engraver Ips pini (Say). Pages 117-119 in A. G. Davidson and R. M. Prentice, Important forest insects and diseases of mutual concern to Canada, the United States and Mexico. Canada Department of Forestry and Rural Development, Forestry Branch, Publication 1180. 248 p.
- Wygant, N. D., and R. R. Lejeune. 1967. Engelmann spruce beetle Dendroctonus obesus (Mann.) (=D. engelmanni Hopk.). Pages 92-95 in A. G. Davidson and R. M. Prentice (eds.), Important forest insects and diseases of mutual concern to Canada, the United States, and Mexico. Canada Department of Forestry and Rural Development, Forestry Branch, Publication 1180. 248 p.
- Wygant, N. D., and A. L. Nelson. 1949. Four billion feet of beetle-killed spruce . United States Department of Agriculture, Yearbook 1949:417-422.