TY  - BOOK
AU  - Gratzer,George A.
TI  - Lattice theory: first concepts and distributive lattices 
SN  - 0716704420
U1  - 511.33 23 
PY  - 1971///
CY  - San Francisco
PB  - Freeman
KW  - Lattice theory
N1  - Includes index; Bibliography p. 207-12
ER  -