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- Milne, D. H., and R. L. Giese. 1969. The Columbian timber beetle, Corthylus columbianus (Coleoptera, Scolytidae). IX, Population biology and gallery characteristics. Entomological News 80(9):225-237.
- Milne, D. H., and R. L. Giese. 1970. The Columbian timber beetle, Corthylus columbianus (Coleoptera: Scolytidae). X, Comparison of yearly mortality and dispersal losses with population densities. Entomological News 81(1):12-24.