TY  - BOOK
AU  - Zehna,Peter W.
AU  - Johnson,Robert L.
TI  - Elements of set theory
AV  - QA248.3 .Z45 1972
U1  - 511/.3 
PY  - 1972///]
CY  - Boston
PB  - Allyn and Bacon
KW  - Set theory
KW  - Local
KW  - Logic, Symbolic and mathematical
N1  - Bibliography: p. 179-180
ER  -