Tributes to Paul Tillich: Paul Tillich's impact on America / J.C. Brauer -- The sources of Paul Tillich's richness / W. Pauck -- Paul Tillich and the history of religions / M. Eliade -- Essays by Paul Tillich: The effects of space exploration on man's condition and stature -- Frontiers -- The decline and the validity of the idea of progress -- The significance of the history of religions for the systematic theologian.