The latter consisted chiefly of rubber, palm oil and kernels, coffee, piassava fiber, ivory, ginger, camwood, and arnotto.
"The Negro" by W.E.B. Du Bois
The exports also include hides, mangabeira rubber, piassava fibre, diamonds, cabinet woods and rum.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2" by Various