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In page Louisiana Purchase Exposition:
"As with the World's Columbian Exposition in Chicago in 1893, all but one of the Louisiana Purchase Exposition's grand, neo-Classical exhibition palaces were temporary structures, designed to last but a year or two. They were built with a material called "staff", a mixture of plaster of Paris and hemp fibers, on a wood frame. As at the Chicago World's Fair, buildings and statues deteriorated during the months of the Fair and had to be patched.[citation needed]
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