Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3 :
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3 : "McKinley, William" to "Magnetism, Terrestrial" [electronic resource] /
Various
- Project Gutenberg, 2013
- Project Gutenberg 43060 .
Public domain in the USA.
Electronic text
Public domain in the USA.
Electronic text