Answers to Baron A. Humboldt’s queries on Botanical Geography (London, Ende 1816 oder Anfang 1817)

  • 11v
  • Tagebuch der russisch-sibirischen Reise 1829

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Catalogue of Life

Biodiversity Heritage Library

GBIF Backbone Taxonomy

Tropicos - Missouri Botanical Garden

The International Plant Names Index

Encylopedia of Life

Wikipedia (eng.)