00334nam a2200133Ia 4500008004100000082001700041100002000058245002200078260004600100300000800146650001600154650001800170653001200188170901s1968    xx            000 0 und d  a512.89bG69U  aGratzer, George 0aUniversal Algebra  aNew JerseybD. Van Nostrand Companyc1968  a368  aMathematics  aPure Sciences  aAlgebra