Author:Walter Sheldon Tower
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Articles in Popular Science Monthly
- "The Mississippi River Problem" in Popular Science Monthly, 73 (July 1908)
- "The Passing of the Sturgeon: A Case of the Unparalleled Extermination of a Species" in Popular Science Monthly, 73 (October 1908)
- "Geographic Influences in the Evolution of Nations" in Popular Science Monthly, 78 (February 1911)
- "The Nitrate Fields of Chile" in Popular Science Monthly, 83 (September 1913)
Some or all works by this author are in the public domain in the United States because they were published before January 1, 1928.
The longest-living author of these works died in 1969, so these works are in the public domain in countries and areas where the copyright term is the author's life plus 53 years or less. These works may 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.