Photograph of a native rubber tree in a forest in the early 20th century.

Photograph of men and machinery in the Atherton Estate Factory [Malaysia] in the early 20th century.

Photograph of a man demonstrating the Brazilian method of curing Para rubber by holding it in a cup over a campfire in the early 20th century.

Photograph of castilloa [castilla] among "alang-alang" planted by Englishmen in German New Guinea in the early 20th century.

Photograph of Castilloa elastica plants at the Plantation Anna Regina in Essequibo, [Guyana, South America] in the early 20th century.

Photograph of a Ceara rubber tree on a rubber plantation in the early 20th century. Image possibly taken from the India Rubber Journal.

Photograph of two men standing next to a Ceara rubber tree that has been tapped using the full herring-bone system in Hawaii in the early 20th century.

Photograph of a Chinese tree tapper at work on the Atherton Estate in [Malaysia?] in the early 20th century.

Photograph of an 18 year old Ficus Elastica bush owned by Monsieur Pidange on Rue Jules Ferry in Hanoi, [Vietnam] in the early 20th century.

Photograph of a man standing next to a Ficus Elastica bush near a river in the early 20th century.