TY  - BOOK
AU  - Roberts Don D
TI  - Existential graphs of Charles S Peirce
T2  - Approaches to Semiotics. Ed by Thomas A Sebeok.27
U1  - R14wM39, L3 
PY  - 1973///
CY  - Hague
PB  - Mouton          
KW  - Philosophy-Symbolic Logic
N1  - Bibliography: P 155-58; Appendix: P 129-54
ER  -