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Stratigraphic distribution, ecology, and functional morphology, phylogeny, and systematic paleontology of 86 species of Ordovician summetrical univalved mollusks from the midcontinent.
Additional title page description: A description of a Middle and Upper Ordovician limestone formation and its constituent members with a discussion of facies relations, environments of deposition, and paleogeography.
1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.