Description: Papers of Paul Handler (1929-1998), Professor of Physics (1956-1998), contain an audiocassette tape, correspondence, newsletters, newspaper articles, photographs, publications, research reports, and research data concerning the effect of volcanic aerosols on worldwide climate fluctuations and crop yields, PLATO, Population Dynamics Group, demographic forecasting, long-range climate- and crop-forecasting, and the surface physics and optical properties of semiconductors.