https://www.biodiversitylibrary.org/item/14437An illustration of the genus Cinchona :comprising descriptions of all the officinal Peruvian barks, including several new species, Baron de Humboldt's Account of the Cinchona forests of South America, and Laubert's Memoir on the different species of quinquina: to which are added several dissertations of Don Hippolito Ruiz on various medicinal plants of South America (1821)
