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  1. By: Brehm, Alfred Edmund, - Heck, Ludwig, - Hempelmann, Friedrich, - Heymons, Richard, - Marshall, William, - Werner, Franz, - Zur Strassen, Otto, - Bibliographisches Institut Leipzig.
    Edition: hrsg. von Prof. Dr. Otto zur Strassen ...
    Publication info: Leipzig, Bibliographisches Institut, 1911-19-
    Holding Institution: Multiple institutions
  2. By: Heck, Ludwig,
    Publication info: Leipzig, Rossberg'schen buchdruckerei, 1885.
    Holding Institution: Columbia University Libraries (archive.org)
  3. By: Heck, Ludwig,
    Publication info: Berlin : W. Pauli ; 1894-1897.
    Holding Institution: Naturalis Biodiversity Center