There are 3 matches

Collection Authorizer Collection name Reference
23116S. Holland Guttenberg Formation, Iowa and Wisconsin Rocklandian - Ordovician 4-5 - Iowa/Wisconsin DeMott (1987)
23119S. Holland Grand Detour Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin DeMott (1987)
23120S. Holland Mifflin Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin DeMott (1987)

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