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R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.
Published online by Cambridge University Press: 01 May 2009
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