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  1. By: Bolk, L. (Louis),
    Publication info: Jena :Verlag von Gustav Fischer,1914.
    Holding Institution: West Virginia University Libraries (archive.org)
  2. By: Bolk, L. (Louis),
    Publication info: Jena :Verlag von Gustav Fischer,1913.
    Holding Institution: West Virginia University Libraries (archive.org)
  3. By: Bolk, L. (Louis),
    Publication info: Jena,G. Fischer,1913.
    Holding Institution: Smithsonian Libraries
  4. By: Bolk, L. (Louis),
    Publication info: Haarlem,1907
    Holding Institution: Smithsonian Libraries
  5. By: Bolk, L. (Louis),
    Publication info: Jena :Verlag von Gustav Fischer,1919.
    Holding Institution: West Virginia University Libraries (archive.org)