Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 :
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 : "Echinoderma" to "Edward" [electronic resource] /
Various
- Project Gutenberg, 2011
- Project Gutenberg 34992 .
Public domain in the USA.
Electronic text
Encyclopedias and dictionaries
AE
Public domain in the USA.
Electronic text
Encyclopedias and dictionaries
AE