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  1. New Silurian Heterostraci from southeastern Yukon / Robert H. Denison. Intro. by H.R. Hovdebo, A.C. Lenz [and] E.W. Bamber.
    By: Denison, Robert H. - Bamber, E. W. - Hovdebo, H. R. - Lenz, A. C.
    Publication info: [Chicago]Chicago Natural History Museum,1963.
    Contributed by: University of Illinois Urbana Champaign
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