Description: [caption id="" align="aligncenter" width="378" caption="George S. Switzer, Division of Mineral Sciences Chairman, 1963-1968; Associate Curator, 1948-1956, standing at left, with Durward Howes seated at desk, and Associate Curator Paul Desautels standing to the right. Mr. Howes is looking at a collection of Mississippi freshwater pearls that he donated to the Smithsonian, April