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  1. Annotated bibliography of Lower Paleozoic sponges of North America / [by] J. Keith Rigby -- and Matthew H. Nitecki --.
    By: Rigby, J. Keith. - Nitecki, Matthew H.,
    Publication info: [Chicago]Field Museum Press ,1968.
    Contributed by: University of Illinois Urbana Champaign
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  2. New Archaeoscyphia (Porifera) from the Ordovician of Anticosti Island, Quebec / J. Keith Rigby -- and Matthew H. Nitecki --.
    By: Rigby, J. Keith. - Nitecki, Matthew H.,
    Publication info: [Chicago] :Field Museum of Natural History,1973.
    Contributed by: University of Illinois Urbana Champaign
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