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An Unusual Trilobite Faunule From Llandeilo or Lowest Caradoc Strata (Middle Ordovician) of northern Yukon Territory
Ludvigsen, R; in, Current Research Part B / Recherches en cours Partie B
. Geological Survey of Canada, Paper no. 80-1B,
1980 p. 97-106, https://doi.org/10.4095/102154