Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Merrill, L. D., D. L. Wood, and J. H. Cane. 1988. Hybridization barriers in Group IX ips: I hoppingi Lanier and I confusus (LeConte) (Coleoptera: Scolytidae). International Congress of Entomology 18:430-430.
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