Enlargement of a section of this late, simplified version of Humboldt's sketch. (IMAGE)

Proceedings of the National Academy of Sciences

Enlargement of a section of this late, simplified version of Humboldt's sketch.

Caption

Enlargement of a section of this late, simplified version of Humboldt's sketch of Andean vegetation highlights the cave of Antisana.

Credit

Image courtesy of Pierre Moret.

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