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Pennsylvanian invertebrates of the Mazon Creek area, Illinois: the Essex fauna and medusae / Ralph Gordon Johnson -- and Eugene S. Richardson, Jr. --
By: Johnson, Ralph Gordon, - Richardson, Eugene Stanley,
Publication info: [Chicago] :Field Museum Press ,1968.
Contributed by: University of Illinois Urbana Champaign
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Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: the morphology and affinities of Tullimonstrum / Ralph Gordon Johnson -- and Eugene S. Richardson, Jr. --
By: Johnson, Ralph Gordon, - Richardson, Eugene Stanley,
Publication info: [Chicago] :Field Museum of Natural History ,1969.
Contributed by: University of Illinois Urbana Champaign
View record View book
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