Advances in water pollution research.

1962 v.1; v.1 1962; 1st conference 1962 v.1; 1962 v.2; v.2 1962; 1st conference v.2 1962; 1962 v.3; v.3 1962; 1st conference v.3 1962; 1964 v.1; v.1 1964; 2nd conference v.1 1964; 1964 v.2; v.2 1964; 2nd conference v.2 1964; 1964 v.3; v.3 1964; 2nd conference v.3 1964; 1966 v.1; 3rd conference v.1 1966; 1966 v.2; 3rd conference v.2 1966; 1966 v.3; 3rd conference v.3 1966; 1969; 4th conference 1969; 5th conference 1970 v.1; 5th conference 1970 v.2; 6th conference 1972