text: The Cro-Magnon shelter ( Abri de Cro-Magnon ) on the north side of town is the spot where , in 1868 , railway workers uncovered three 30,000-year-old human skel ? ­ e ? ­ tons beside their flint and bone tools .
  
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  In 1868 three human skeletons dating back several thousands of years were found by the railway workers .