|"The object of opening the mind, as of opening the mouth,
is to shut it again on something solid."
* The Internet Archive, Clausewitz.
* Search for Clausewitz in Marxists.org archives containing works by numerous key Marxist writers. (This Google engine returned 380 hits from the Marxists.org archive on 3 July 2012.) [Search entire archive.]
* The Library of Congress On-Line Catalog Search System (an excellent place to find old, obscure, and non-English-language works by or about Clausewitz). A "Basic Search" by keyword appears to be the best way to find interesting items.