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  1. The copper-bearing rocks of lake Superior / by Roland Duer Irving.
    By: Irving, Roland Duer,
    Publication info: Washington,Govt. Print. Off.,1883.
    Holding Institution: University of Connecticut Libraries (archive.org)
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  2. The Penokee iron-bearing series of Michigan and Wisconsin /
    By: Irving, Roland Duer, - Van Hise, Charles Richard,
    Publication info: Washington, D. C. :U.S. Govt. Print. Off.,1892.
    Holding Institution: University of Connecticut Libraries (archive.org)
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