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  1. By: Ecker, A. - Wiedersheim, Robert Ernst Eduard,
    Publication info: Braunschweig,1864-82.
    Holding Institution: Natural History Museum Library, London
    BHL Collections: Charles Darwin's Library
  2. By: Wiedersheim, Robert Ernst Eduard, - Parker, W. N. (William Newton),
    Edition: 3d ed. (founded on the 6th German ed.) With three hundred and seventy-two figures and bibliography.
    Publication info: London,Macmillan and co., limited,1907.
    Holding Institution: University of California Libraries (archive.org)