Hartwig, G.L.
Hartwig, G.; Guernsey, A.H. 1875. The polar and tropical worlds: a description of man and nature in the polar and equatorial regions of the globe. Springfield, Mass., C.A.Nichols. pp. 1-815.
Hartwig, G. 1873. The tropical world: a popular scientific account of the natural history of the animal and vegetable kingdoms in the equatorial regions. London, Longmans.
Hartwig, G. 1868. Tussen de keerkringen: Schetsen uit het dier- en plantenrijk. Translated by J.J. Hupscher. Arnhem, H.A. Tjeenk Willink.
Hartwig, G. 1860. Die Tropenwelt im Thier- und Pflanzenleben dargestellt. Wiesbaden, Kreidel und Niedner.






