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  1. An account of the Deep-Sea Ophiuroidea collected by the Royal Indian Marine Survey ...
    By: Koehler, R.
    Publication info: Calcutta,1899.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  2. Astéries, ophiures, et échinides / by R. Koehler.
    By: Koehler, R. - British Antarctic Expedition (1907-1909)
    Publication info: London :W. Heinemann,1911.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  3. Illustrations of the shallow-water Ophiuroidea: collected by the Royal Indian Marine Survey ship Investigator/ by R. Koehler ...
    By: Koehler, R.
    Publication info: Calcutta,Printed by order of the Trustees of the Indian Museum,1900.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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