1931: A Glance at the Twentieth Century by Hartshorne, Henry, 1823-1897

Subjects: “…Twentieth century -- Forecasts…”
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Anticipations Of the Reaction of Mechanical and Scientific Progress upon Human life and Thought by Wells, H. G., 1866-1946 (Herbert George)

Subjects: “…Twentieth century -- Forecasts…”
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The lesson of this century with two talks on freedon and the democratic state

Subjects: “…Twentieth century…”

The encyclopedia of the modern world 1900 to the present

Subjects: “…Twentieth century Encyclopedias…”