Author: NORFORD, B.S. ET AL.
Title: Advance formation: stratigraphy and biostratigraphy of a new ordovician formation from the Rocky Mountians, northeastern British Columbia.
Description: 1996. Geological Survey of Canada Bulletin 491; 129 pp. many figs. 23 plts. with fossils. Orig. wrps. very good, 4to.

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