|←Author Index: Sp||Oswald Spengler
|German historian and philosopher whose interests also included mathematics, science, and art. He is best known for his book The Decline of the West (Der Untergang des Abendlandes) in which he puts forth a cyclical theory of the rise and decline of civilizations.|
- The Decline of the West Volume 1 
- The Decline of the West Volume 2 
- Prussianism And Socialism (1920) 
Some or all works by this author are in the public domain in the United States because they were published before January 1, 1923.
The author died in 1936, so works by this author are also in the public domain in countries and areas where the copyright term is the author's life plus 75 years or less. Works by this author may also be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works.