• Aspects of nature, in different lands and different climates (Vol. 1 of 2): with scientific elucidations
• Aspects of nature, in different lands and different climates (Vol. 2 of 2): with scientific elucidations
• 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
• Views of nature: or Contemplations on the sublime phenomena of creation: with scientific illustrations