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The Nation's River: A report on the Potomac From the U.S. Department of the Interior
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The Nile Tributaries of Abyssinia, and the Sword Hunters of the Hamran Arabs
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The Albert N'Yanza, Great Basin of the Nile, And Explorations of the Nile Sources
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Waterways of Westward Expansion - The Ohio River and its Tributaries
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The Guardians of the Columbia Mount Hood, Mount Adams and Mount St. Helens
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Travels to Discover the Source of the Nile, Volume 1 (of 5) In the years 1768, 1769, 1770, 1771, 1772 and 1773
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Travels to Discover the Source of the Nile, Volume 2 (of 5) In the years 1768, 1769, 1770, 1771, 1772 and 1773
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Travels to Discover the Source of the Nile, Volume 3 (of 5) In the years 1768, 1769, 1770, 1771, 1772 and 1773
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Travels to Discover the Source of the Nile, Volume 4 (of 5) In the years 1768, 1769, 1770, 1771, 1772 and 1773
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Select Specimens of Natural History Collected in Travels to Discover the Source of the Nile. Volume 5.
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