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Togersen, T.R. 1968, Parasites of the hemlock sawfly, Neodiprion tsugae, in coastal Alaska. Annals of the Entomological Society of America 61(5):1155-1158
Torgersen, T.R. 1969, Hymenopterous parasites of the hemlock sawfly, Neodiprion tsugae Middleton, in S.E. Alaska, with a key to larval remains. Journal of the Entomological Society of British Columbia 66:53-62