University of Illinois at Chicago Century of Progress World's Fair, 1933-1934 (University of Illinois at Chicago)
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"One milligram of protactinium, the total supply of element 9, rarer than radium from whose wastes it
1. "One milligram of protactinium, the total supply of element 9, rarer than radium from whose wastes it was extracted, was placed on exhibit in the Hall of Science of the World's Fair today (Thursday, September 27th). LaDonne Patier is shown here with the rare exhibit which was isolated and placed in the periodic table of elements by Dr. Aristid von Grosse of the University of Chicago department of chemistry. Dr. von Grosse extracted the element from 15,000 milligrams of radium waste obtained form Czechoslovakia."
   

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