Alexander von Humboldt
Per­sonal Nar­ra­tive of Trav­els to the Equinoc­tial Re­gions of Amer­ica, Dur­ing the Year 1799-1804 — Vol­ume 2
Alexander von Humboldt
COS­MOS: A Sketch of the Phys­i­cal De­scrip­tion of the Uni­verse, Vol. 1
Alexander von Humboldt
Per­sonal Nar­ra­tive of Trav­els to the Equinoc­tial Re­gions of Amer­ica, Dur­ing the Year 1799-1804 — Vol­ume 3
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