Roberts, Don D. <br/><br/>
The existential graphs of Charles S. Peirce / 
by Don D. Roberts 
 - Mouton :  The Hague  1973 
 - 168 p. ; 
 - Approaches to semiotics ;  27 .
<br/><br/>Bibliography: p. 155-158 
<br/><br/><label>Subjects--Personal Names: </label><br/>Peirce, Charles S.--1839-1914
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic diagrams