720 XTF Search Results (subject=Civilization;subject-join=exact;smode=simple;brand=default;f1-subject=Intellect);subject-join%3Dexact;smode%3Dsimple;brand%3Ddefault;f1-subject%3DIntellect Results for your query: subject=Civilization;subject-join=exact;smode=simple;brand=default;f1-subject=Intellect Thu, 01 Jan 1970 12:00:00 GMT Increased mental activity of the age: its causes and demands : an address delivered before the literary societies of the University of Michigan, June 26th, 1854. Haven, E. O. (Erastus Otis), 1820-1881, University of Michigan Thu, 01 Jan 1970 12:00:00 GMT