- Allen, S. J., and L. L. Unger. 1975. Forest insect and disease conditions 1974: Prince George District. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-114. 9 p.
- Allen, S. J., and L. L. Unger. 1976. Forest insect and disease conditions, Prince George Forest District, British Columbia, 1975. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-135. 8 p.
- Cottrell, C. B., L. S. Unger, and R. L. Fiddick. 1979. Timber killed by insects in British Columbia 1971-1975. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-189. 31 p.
- Unger, J. 1811. Kurze Beschreibung des verheerenden Borkenkafers (Dermestes typographus Linn) sonst auch Bostrichus ligniperda . Oekonomische Neuigkeiten und Verhandlungen 1355-358, 454.
- Unger, L. S. 1975. Forest insect and disease conditions 1974: Yukon Territory. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-117. 13 p.
- Unger, L. S. 1976. Forest insect and disease conditions, Yukon Forest District, 1975. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-138. 4 p.
- Unger, L. S. 1977. Forest insect and disease conditions, Yukon Forest District, 1976. Canada Department of Fisheries and Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria British Columbia, Information Report BC-X-163. 4 p.
- Unger, L. S. 1978a. Forest insect and disease conditions, Yukon Territory, 1977. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-176. 4 p.
- Unger, L. S. 1978b. Spruce beetle infestations in the Prince George Forest District. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Pest Leaflet (June). 1 p.
- Unger, L. S. 1978c. Spruce beetle infestations in the Prince George Forest District. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Pest Leaflet (August). 1 p.
- Unger, L. S., and R. L. Fiddick. 1979. Forest insect and disease conditions, Prince George Forest Region, British Columbia, 1978. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-193. 7 p.
- Wood, R. O., and L. S. Unger. 1977. Forest insect and disease conditions, Prince George Forest District, British Columbia, 1976. Canada Department of Fisheries and the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-160. 7 p.
- Wood, R. O., and L. S. Unger. 1978. Forest insect and disease conditions, Prince George Forest District, British Columbia, 1977. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-173. 7 p.
- Unger, L. 1993. Mountain pine beetle. Natural Resources Canada, Canadian Forestry Service, Pacific and Yukon Regions (Victoria, B.C.), Forest Pest Leaflet 78.