TY  - BOOK
AU  - Bowran,A.P., x
AU  - x
TI  - Aboolean algebra: Abstract and concrete
SN  - x
U1  - 512/BOB 
PY  - 1967///
CY  - London.
PB  - Macmillan
KW  - Algeera
N1  - x
ER  -