<Ul> <Li> Hudson Sesquicentennial half dollar (1935) </Li> <Li> California Pacific International Exposition half dollar (1935--1936) </Li> <Li> Old Spanish Trail half dollar (1935) </Li> <Li> Rhode Island Tercentenary half dollar (1936) </Li> <Li> Cleveland Centennial half dollar (1936) </Li> <Li> Wisconsin Territorial Centennial half dollar (1936) </Li> <Li> Cincinnati Musical Center half dollar (1936) </Li> <Li> Long Island Tercentenary half dollar (1936) </Li> <Li> York County, Maine Tercentenary half dollar (1936) </Li> <Li> Bridgeport, Connecticut Centennial half dollar (1936) </Li> <Li> Lynchburg Sesquicentennial half dollar (1936) </Li> <Li> Elgin, Illinois, Centennial half dollar (1936) </Li> <Li> Albany Charter half dollar (1936) </Li> <Li> San Francisco--Oakland Bay Bridge half dollar (1936) </Li> <Li> Columbia, South Carolina Sesquicentennial half dollar (1936) </Li> <Li> Delaware Tercentenary half dollar (1936) </Li> <Li> Battle of Gettysburg half dollar (1936) </Li> <Li> Norfolk, Virginia, Bicentennial half dollar (1936) </Li> <Li> Roanoke Island half dollar (1937) </Li> <Li> Battle of Antietam half dollar (1937) </Li> <Li> New Rochelle, New York half dollar (1938) </Li> <Li> Iowa Centennial half dollar (1946) </Li> <Li> Booker T. Washington Memorial half dollar (1946--1954) </Li> </Ul> <Li> Hudson Sesquicentennial half dollar (1935) </Li> <Li> California Pacific International Exposition half dollar (1935--1936) </Li> <Li> Old Spanish Trail half dollar (1935) </Li>

When did they stop making silver 50 cent pieces