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Correlation of the Lower Middle Devonian Elenisporis biformis spore subzone in Arctic Canada and the U.S.S.R.
Arkhangelskaya, A D; McGregor, D C; Richardson, J B; in, Current Research Part D, Interior Plains and Arctic Canada / Recherches
En Cours Partie D, Plaines Interieures Et Region Arctique Du Canada
; Geological Survey of Canada. Geological Survey of Canada,
Paper no. 90-1D, 1990 p. 213-217, https://doi.org/10.4095/131357