Author:Theodore Francis Van Wagenen
- "Gold" in Popular Science Monthly, 72 (January 1908), pp. 65–74
- "Silver" in Popular Science Monthly, 73 (September 1908), pp. 267–276
- "The World's Annual Metal Crop" in Popular Science Monthly, 74 (March 1909), pp. 271–283
- "International Coinage" in Popular Science Monthly, 76 (March 1910), pp. 287–292
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 1935, so these works are in the public domain in countries and areas where the copyright term is the author's life plus 87 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.