
Henry Edward Armstrong
Works
- "Valency," in Encyclopædia Britannica (11th ed., 1911)
- "Chemistry," in Encyclopædia Britannica (12th ed., 1922)
Articles in Popular Science Monthly
- "Scientific Education" in Popular Science Monthly, 45 (September 1894)
- "Scientific Method in Board Schools" in Popular Science Monthly, 46 (March 1895)

Some or all works by this author are in the public domain in the United States because they were published before January 1, 1927.
The author died in 1937, 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 80 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.
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