|
1
|
|
|
|
QA251
.C6
|
Universal algebra/P. M. Cohn
|
New York, [ United States ] : Harper & Row Publishers , 1965
|
Cohn ,P.M.
|
|
114630
|
|
2
|
|
|
|
QA251
.G7
|
Universal algebra/by George Gratzer
|
New Jersey, [ United States ] : D. Van Nostrand Company, Inc. , 1968
|
Gratzer, George
|
|
114633
|