TY  - BOOK
AU  - Spencer-Brown,G.
TI  - Laws of form
SN  - 0525475443
AV  - QA9 .S63 1979
U1  - 511/.3 
PY  - 1979///
CY  - New York
PB  - Dutton
KW  - Logic, Symbolic and mathematical
N1  - "A Dutton paperback."; Includes index; Bibliography: p. 136-137
UR  - http://www.archive.org/details/lawsofform00spenrich
UR  - http://www.openlibrary.org/books/OL24212174M
ER  -