TY  - BOOK
AU  - Zehna,Peter W.
AU  - Johnson,Robert L.
TI  - Elements of set theory
U1  - 512.817 
PY  - 1962///
CY  - Boston
PB  - Allyn and Bacon
KW  - Set theory
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references and index
ER  -