![Humboldt, Alexander von. 1819-1829. Personal narrative of travels to the equinoctial regions of the New Continent, during the years 1799-1804. By Alexander de Humboldt, and Aimé Bonpland; with maps, plans, &c. written Humboldt, Alexander von. 1819-1829. Personal narrative of travels to the equinoctial regions of the New Continent, during the years 1799-1804. By Alexander de Humboldt, and Aimé Bonpland; with maps, plans, &c. written](http://darwin-online.org.uk/converted/scans/1814-29_Humboldt_A597.1-7(online)/1814-29_Humboldt_A597.7_284.jpg)
Humboldt, Alexander von. 1819-1829. Personal narrative of travels to the equinoctial regions of the New Continent, during the years 1799-1804. By Alexander de Humboldt, and Aimé Bonpland; with maps, plans, &c. written
![Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy](https://c8.alamy.com/comp/K3N86E/ratti-valley-tracciolino-trail-codera-valley-sondrio-province-lombardy-K3N86E.jpg)
Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy
![Foggy claw over Lecco mountains, Lecco province, lake Como, Lombardy, Italy, Europe, Stock Photo, Picture And Rights Managed Image. Pic. VF1-2922802 | agefotostock Foggy claw over Lecco mountains, Lecco province, lake Como, Lombardy, Italy, Europe, Stock Photo, Picture And Rights Managed Image. Pic. VF1-2922802 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/9863cd6b22441b0c2cc16b7ede304f83/vf1-2922802.jpg)
Foggy claw over Lecco mountains, Lecco province, lake Como, Lombardy, Italy, Europe, Stock Photo, Picture And Rights Managed Image. Pic. VF1-2922802 | agefotostock
![Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy](https://l450v.alamy.com/450v/k3n86e/ratti-valley-tracciolino-trail-codera-valley-sondrio-province-lombardy-k3n86e.jpg)
Ratti valley, Tracciolino trail, Codera valley, Sondrio province, Lombardy, Italy, Europe. The dam in Ratti valley Stock Photo - Alamy
![Humboldt, Alexander von. 1819-1829. Personal narrative of travels to the equinoctial regions of the New Continent, during the years 1799-1804. By Alexander de Humboldt, and Aimé Bonpland; with maps, plans, &c. written Humboldt, Alexander von. 1819-1829. Personal narrative of travels to the equinoctial regions of the New Continent, during the years 1799-1804. By Alexander de Humboldt, and Aimé Bonpland; with maps, plans, &c. written](http://darwin-online.org.uk/converted/scans/1814-29_Humboldt_A597.1-7(online)/1814-29_Humboldt_A597.7_278.jpg)