The construction of vision, 1843-1867 -- Learning landscapes, 1868-1869 -- The transportable view, 1870-1871 -- Transforming the view, 1871-1878 -- The commercial traveler, 1879-1894 -- The frontier thesis, 1892-1894 -- The imperial frontier, 1896-1924 -- Incorporated man, 1896-1898 -- Man as myth, 1924-1942.
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