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Nature's teachings: human invention anticipated by nature
The ocean
The River Congo from its mouth to Bólobó; with a general description of the natural history and anthropology of its western basin
Cultivated plants and domestic animals in their migration from Asia to Europe
Forests of Porto Rico : past, present, and future and their physical and economic environment
The travels and researches of Alexander von Humboldt
Riddles of the Sphinx : a study in the philosophy of evolution
Dictionary of American Indians north of Mexico
Emin Pasha in central Africa : being a collection of his letters and journals