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Wedekind, Rudolf (1883-1961) Königlich Preussische Geologische Landesanstalt

Spencer, Arthur Coe (1871-1964) United States of America. Geological Survey.

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Lupton, Charles Thomas (1878-1935) United States of America. Geological Survey.

Stebinger, Eugene (1883-1951) United States of America. Geological Survey.

Zimmermann, Max Georg (1861-1919). Editor