- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1959. Key to Southern forest tree insects—based on damage symptoms . Forest Farmer, Manual Edition 19:106-107.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1964. Key to southern forest tree insects—based on damage symptoms . Forest Farmer, Manual Edition 23:32-40.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1966. Key to forest tree insects of the South . Forest Farmer, Manual Edition 25:80-84.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1968. Key to forest tree insects of the South . Forest Farmer, Manual Edition 27:40-43.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1971. Key to southern forest tree insects of the South . Forest Farmer, Manual Edition 30:96-102.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1972. Key to forest tree insects of the South . Forest Farmer, Manual Edition 31:31-36.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1975. Key to damage of southern forest trees by insects . Forest Farmer 39:114-119.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1977. Key to damage of southern forest trees by insects . Forest Products Dir. 1977:144-149.
- Ebel, B. H., E. P. Merkel, and R. J. Kowal. 1980. Insect damage: key to identification of southern forest pests . Forest Farmer, Manual Edition, 23rd Edition, 39:101-106.
- Foltz, J. L., E. P. Merkel, and R. C. Wilkinson. 1984. Annotated bibliography of Dendroctonus terebrans (Olivier), Ips avulsus (Eichhoff), Ips grandicollis (Eichhoff) and Ips calligraphus (Germar) in the southeastern U.S.A. University of Florida, Agricultural Experiment Station, Institute of Food and Agricultural Science, Monograph 12. 47 p.
- Hedlin, A. F., H. O. Yates, D. C. Tovar, B. H. Ebel, T. W. Koerber, and E. P. Merkel. 1980. Cone and seed insects of North American conifers. Canada Department of the Environment, Canadian Forestry Service, Ottawa, Ontario. 122 p.
- Heller, R. C., R. C. Aldrich, W. F. Bailey, and E. P. Merkel. 1955. Status of Ips pine engraver beetle epidemic in southern Georgia, an aerial detection and damage appraisal survey. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Insect Survey, Report 7 (unpublished).
- Hertel, G. D., I. L. Williams, and E. P. Merkel. 1977. Insect attacks on and mortality of slash and longleaf pines treated with paraquat to induce lightwood formation. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Research Paper SE-169. 13 p.
- Hoekstra, P. E., E. P. Merkel, and H. R. Powers. 1961. Production of seeds of forest trees. Pages 227-232 in Alfred Stefferud (ed.), Seeds. United States Department of Agriculture, Yearbook, Washington, D. C. 591 p.
- Hoffmann, C. H., and E. P. Merkel. 1948. Fluctuations in insect populations associated with aerial applications of DDT to forests . Journal of Economic Entomology 41:464-473.
- Merkel, E. P. 1952. The black turpentine beetle . United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Northeastern Florida Station Report 1952:1.
- Merkel, E. P. 1954a. Southern pine beetle conditions on the Cherokee National Forest and adjoining private lands. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest-Pest Survey Report 2. 4 p.
- Merkel, E. P. 1954b. Southern pine beetle conditions in western North Carolina and eastern Tennessee . United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Pest Survey Report 1954:1.
- Merkel, E. P. 1956. Bark beetle epidemics and rainfall deficiency in the Southeast . Association of Southern Agricultural Workers, Proceedings 53:130.
- Merkel, E. P. 1957. Forest entomology in the South—past, present and future . Florida Entomologist 40:119-122.
- Merkel, E. P. 1959. Insects causing seed losses in seed-production areas. Direct seeding in the South. Symposium. Duke University, School of Forestry 1959:32-35.
- Merkel, E. P. 1976. Control of seed-destroying insects in the southern United States with insecticides and behavioral chemicals. Pages 362-368 in Proceedings, Division II (Forest plants and forest protection), XVI International Union of Forest Research Organizations World Congress, Oslo, Norway, 20 June- 2 July 1976. As, Norway.
- Merkel, E. P. 1977. Three insecticides reduce tree mortality and insect attacks of paraquat-treated slash pines. Page 19 in M. H. Esser, Annual Meeting of the Lightwood Research Coordinating Council, Proceedings 1977. 193 p.
- Merkel, E. P. 1978. Effect of season of paraquat application and different insecticides on bark beetle-caused slash pine mortality. Page 82 in M. H. Esser (ed.), Proceedings, Annual Meeting of the Lightwood Research Coordination Council, 10-11 January, Atlantic Beach, Florida. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 211 p.
- Merkel, E. P. 1979. Field trial of lindane, phosmet, and fenitrothion to prevent insect-caused mortality of paraquat-treated slash pines. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Research Note SE-278. 4 p.
- Merkel, E. P. 1981. Control of the black turpentine beetle. Georgia Forestry Commission (Macon, Georgia), Forestry Research Paper 15. 7 p.
- Merkel, E. P., and E. W. Clark. 1981. Insecticides for preventing insect-caused mortality of paraquat-treated slash pines. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Research Paper SE-219. 6 p.
- Merkel, E. P., R. C. Heller, R. C. Aldrich, and W. F. Bailey. 1955. Ips pine engraver beetle epidemic in southern Georgia—an aerial detection and damage appraisal survey. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Insect Survey Report 1. 9 p.
- Merkel, E. P., and R. J. Kowal. 1956. Forest insect conditions in the Southeast during 1955. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Station Paper 67. 9 p. (Processed).
- Merkel, E. P., and H. M. Kulman. 1955. Southern pine beetle and pine engraver beetle conditions in north central South Carolina . United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Paper 67:2-5.
- Merkel, E. P., H. M. Kulman, and e. al. 1955. Beetle conditions in north-central South Carolina . Southern Lumberman 191:60-62.
- Speers, C. F., E. P. Merkel, and B. Ebel. 1955. Tests of insecticides for the control of the southern pine beetle in North Carolina . Association of Southern Agricultural Workers, Proceedings 52:100.
- Williams, I. L., G. D. Hertel, and E. P. Merkel. 1976. Impact and control of insects on slash and longleaf pines treated with paraquat [abstract]. Page 53 in M. H. Esser (ed.), Lightwood Research Coordinating Council, Proceedings of the Annual Meeting, Jacksonville, Florida, 20-21 January 1976.