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— Verein für Erdkunde. Einführung in die Bildersammlung 

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— PETERMANNs Mitteilungen 1906. 



Lima. Sociedad geografica. Boletin 1905, XVIII. 

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London. Geological society. Quarterly Journal 63, 1 — 3. 

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— Geological Magazine IV, 1 — 11. 1907. 



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Lund. Universität. Arsskrift 1906 (2), 2. 



Lüttich (Liege). Societe geologique, Annales 33, 3, 34, 1, 2. 



Luxemburg. Societe des Sciences naturelles. Institut Grand- 



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Madison. Wisconsin Geological and Natural History Survey 

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