- Amman, G. D., M. D. McGregor, D. B. Cahill, and W. H. Klein. 1977. Guidelines for reducing losses of lodgepole pine to the mountain pine beetle in unmanaged stands in the Rocky Mountains. United States Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, General Technical Report INT-36. 19 p.
- Anderson, L. S., A. A. Berryman, D. G. Burnell, W. H. Klein, E. L. Michaelson, and A. R. Stark. 1976. The development of predictive models in the lodgepole pine-mountain pine beetle ecosystem. Pages 149-164 in R. L. Tummala, D. L. Haynes, and B. A. Croft (eds.), Modeling for pest management: concept, techniques, and applications. Michigan State University Press.
- Klein, A. 1963. Untersuchungen uber den Einfluss der belebten und unbelebten Umwelt auf die Mortalitat der Borkenkafer Ips typographus und Pityogenes chalcographus im Gebiet des hessischen Forstamtes Gahrenberg. Diplom Arbeit, Forstl. Fakultat, Univ. Gottingen.
- Klein, W. H. 1966. Intermountain States. Pages 16-20 in J. W. Bongberg, Forest insect and disease conditions in the United States, 1965. United States Department of Agriculture, Forest Service. 47 p.
- Klein, W. H. 1967. Forest insect conditions in the Intermountain States during 1966. United States Department of Agriculture, Forest Service, Division of Timber Management, Intermountain Region, Ogden, Utah. 17 p.
- Klein, W. H. 1968. Forest insect conditions in the Intermountain States during 1967. United States Department of Agriculture, Forest Service, Division of Timber Management, Intermountain Region, Ogden, Utah. 20 p.
- Klein, W. H. 1969. Forest insect control in Utah's northern slopes . 16th Annual Field Conference of Intermountain Geologists Proceedings, Salt Lake City, Utah 16:45-46.
- Klein, W. H. 1970. Mini-aerial photography . Journal of Forestry 68:475-478.
- Klein, W. H. 1973a. Beetle-killed pine estimates . Photogrammetric Engineering 39:385-388.
- Klein, W. H. 1973b. Evaluating a mountain pine beetle infestation with the aid of 35 mm aerial photography. United States Department of Agriculture, Forest Service, Intermountain Region, Ogden, Utah. 7 p.
- Klein, W. H. 1974. Evaluating a mountain pine beetle infestation with the aid of 35 mm aerial photography. United States Department of Agriculture. Forest Service, Intermountain Region, Ogden, Utah. 5 p.
- Klein, W. H. 1975a. Evaluating a mountain pine beetle infestation with the aid of 35 mm aerial photography. United States Department of Agriculture, Forest Service, Intermountain Region, Ogden, Utah. 6 p.
- Klein, W. H. 1975b. Working plan: pilot test of three insecticides for preventing attacks of the mountain pine beetle in lodgepole pine. United States Department of Agriculture, Forest Service, Intermountain Region, Ogden, Utah. 7 p.
- Klein, W. H. 1976a. Evaluating a mountain pine beetle infestation with 35 mm aerial color photography. United States Department of Agriculture, Forest Service, State and Private Forestry, Intermountain Region, Ogden, Utah. Report No. 4., 6 p.
- Klein, W. H. 1976b. Measuring damage to lodgepole pine caused by the mountain pine beetle. Pages 35-41 in W. E. Waters (ed.), Current topics in forest entomology. United States Department of Agriculture, Forest Service, General Technical Report WO-8. 174 p.
- Klein, W. H. 1976c. Pilot study of three insecticides for preventing attacks of the mountain pine beetle in lodgepole pine. United States Department of Agriculture, Forest Service, Supplemental Working Plan. 4 p.
- Klein, W. H. 1976d. Preliminary report of a survey to measure the impact of the mountain pine beetle in a lodgepole pine forest. United States Department of Agriculture, Forest Service, Intermountain Region, Ogden, Utah. 7 p.
- Klein, W. H. 1978. Strategies and tactics for reducing losses in lodgepole pine to the mountain pine beetle by chemical and mechanical means. Pages 148-158 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, Pullman, Washington, 25-27 April. University of Idaho, College of Forest Resources. 220 p.
- Klein, W. H. 1979a. Measuring damage to lodgepole pine caused by the mountain pine beetle. Pages 35-42 in W. E. Waters (ed.), Current topics in forest entomology. United States Department of Agriculture, Forest Service, General Technical Report WO-8. 174 p.
- Klein, W. H. 1979b. Measuring mountain pine beetle-caused tree mortality with aerial photography. Pages 132-135 in Town meeting forestry: issues for the 1980's. Society of American Foresters, Proceedings. 320 p.
- Klein, W. H. 1979c. Workshop: update on westside mountain pine beetle surveys. Pages 61-69 in Thirtieth annual Western Forest Insect Work Conference, Proceedings, Boise, Idaho, 6-8 March 1979. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia. 206 p.
- Klein, W. H. 1982. Estimating bark beetle-killed lodgepole pine with high altitude panoramic photography . Photogrammetric Engineering and Remote Sensing 48:733-737.
- Klein, W. H., W. Bailey, E. Wilson, and I. E. Duggan. 1978. Efficiency of two high elevation camera systems for assessment of insect-caused tree mortality. United States Department of Agriculture, Forest Service, State and Private Forestry, Methods Application Group, Davis, California, Report No. 78-3. 12 p.
- Klein, W. H., D. D. Bennett, and R. W. Young. 1978a. A pilot survey to measure annual mortality of lodgepole pine caused by the mountain pine beetle. United States Department of Agriculture, Forest Service, Intermountain Region and Methods Applications Group, Report 78-4. 15 p.
- Klein, W. H., D. D. Bennett, and R. W. Young. 1978b. Multiphase airphoto assessment for annual losses caused by the mountain pine beetle in lodgepole pine (Preliminary Report). United States Department of Agriculture, Forest Service, Davis, California. 13 p.
- Klein, W. H., D. D. Bennett, and R. W. Young. 1978c. Multiphase airphoto assessment for annual losses caused by the mountain pine beetle in lodgepole pine. Pages 355-366 in Symposium on remote sensing for vegetation damage assessment. Seattle, Washington. 543 p.
- Klein, W. H., D. D. Bennett, and R. W. Young. 1980. Evaluation of panoramic reconnaissance aerial photography for measuring annual mortality of lodgepole prne caused by the mountain pine beetle. United States Department of Agriculture, Forest Service, Forest Insect and Disease Management, Methods Application Group, Davis, California, Report 80-2. 21 p.
- Klein, W. H., and M. D. McGregor. 1966. Forest insect conditions in the Intermountain States during 1965. United States Department of Agriculture, Forest Service, Division of Timber Management, Intermountain Region, Ogden, Utah. 13 p.
- Klein, W. H., and D. L. Parker. 1970. Intermountain States (R-4). Pages 14-17 in A.E. Landgraf, Forest insect and disease conditions in the United States. United States Department of Agriculture, Forest Service. vi + 40 p.
- Klein, W. H., D. L. Parker, and C. E. Jensen. 1978. Attack, emergence, and stand depletion trends of the mountain pipe beetle in a lodgepole pine stand during an outbreak . Environmental Entomology 7:732-737.
- Klein, W. H., D. L. Parker, L. E. Stipe, and A. C. Tegethoff. 1973. Intermountain States (R-4). Pages 23-28 in D. P. Graham and J. F. Chansler, Forest insect and disease conditions in the United States, 1972. United States Department of Agriculture, Forest Service. vi + 72 p.
- Klein, W. H., and L. E. Stipe. 1971. Intermountain States (R-4). Pages 13-16 in A. E. Landgraf, Forest insect conditions in the United States. United States Department of Agriculture, Forest Service. vi + 44 p.
- Klein, W. H., L. E. Stipe, and L. V. Frandsen. 1972. How damaging is a mountain pine beetle infestation? A case study. United States Department of Agriculture, Forest Service, Division of Timber Management, Region 4, Ogden, Utah. 12 p.
- Klein, W. H., and A. C. Tegethoff. 1970. Forest insect and disease conditions in the Intermountain States during 1969. United States Department of Agriculture, Forest Service, Division of Timber Management, Intermountain Region, Ogden, Utah. 11 p.
- Knopf, J. A. E., W. H. Klein, and A. C. Tegethoff. 1977. Intermountain States (R-4). Pages 18-21 in H. V. Toko and T. J. Rogers, Forest insect and disease conditions in the United States, 1974. United States Department of Agriculture, Forest Service. vi + 55 p.
- Klein, E. 1985. Lebendbefall durch den Nutzholzborkenkafer . Allgemeine Forstzeitschrift 12:264.
- Klein, E. 1984. Cryphalus piceae—the most dangerous silver fir bark beetle? . Allgemeine Forstzeitschrift 1984:131-134.