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Free
Alexander von Humboldt
Aspects of Nature (Vol. 2 of 2): In different lands and different climates; with scientific elucidations
Free
Alexander von Humboldt
Views of nature: or Contemplations on the sublime phenomena of creation; with scientific illustrations
Free
Alexander von Humboldt
Letters of Alexander von Humboldt to Varnhagen von Ense.: From 1827 to 1858. With extracts from Varnhagen’s diaries, and letters of Varnhagen and others to Humboldt
Free
Henry J. Horn
Strange Visitors A series of original papers, embracing philosophy, science, government, religion, poetry, art, fiction, satire, humor, narrative, and prophecy, by the spirits of Irving, Willis, Thackeray, Brontë, Richter, Byron, Humboldt, Hawthorne, Wesley, Browning, and others now dwelling in the spirit world; dictated through a clairvoyant, while in an abnormal or trance state
Free
Alejandro de Humboldt
Cristóbal Colón y el descubrimiento de América (2 de 2) / Historia de la geografía del nuevo continente y de los / progresos de la astronomía náutica en los siglos XV y XVI
Free
Alejandro de Humboldt
Cristóbal Colón y el descubrimiento de América (1 de 2) / Historia de la geografía del nuevo continente y de los / progresos de la astronomía náutica en los siglos XV y XVI
Free
Georg Von Der Gabelentz
Die Sprachwissenschaft: Ihre Aufgaben, Methoden und bisherigen Ergebnisse
Free
Johannes Tütken
Privatdozenten im Schatten der Georgia Augusta
Free
Alexander von Humboldt
Reise in die Aequinoctial-Gegenden des neuen Continents v. 4 In deutscher Bearbeitung von Hermann Hauff
Free
Alexander von Humboldt
Rede, gehalten bei der Eröffnung der Versammlung deutscher Naturforscher und Ärzte in Berlin, am 18. September 1828
Free
Wilhelm von Humboldt
Briefe an eine Freundin
Free
Alexander von Humboldt
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 1.
Free
Daniel G. (Daniel Garrison) Brinton
The Philosophic Grammar of American Languages, as Set Forth by Wilhelm von Humboldt With the Translation of an Unpublished Memoir by Him on the American Verb
Free
Alexander von Humboldt
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 3.
Free
Aimé Bonpland, Alexander von Humboldt
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1
Free
Aimé Bonpland, Alexander von Humboldt
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2
Free
Alexander von Humboldt
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 2.
Free
Robert Green Ingersoll
Humboldt From 'The Gods and Other Lectures'
Free
Alexander von Humboldt
Ideen zu einer Physiognomik der Gewächse
Free
Aimé Bonpland, Alexander von Humboldt
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3
Free
Alexander von Humboldt
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
