Llandoverian graptolites of the northern Canadian Cordillera : petalograptus, cephalograptus, rhaphidograptus, dimorphograptus, retiolitidae, and monograptidae / Alfred C. Lenz.
By: Lenz, A. C.
Contributor(s): Royal Ontario Museum.
Material type:
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Bibliography: p. 138-144.
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