Textiles from Peru's central coast, 750-1100 - Young-Sánchez, Margaret (Thesis (Ph. D.)–Columbia University, 2000., 2000)
"This thesis describes and analyzes gravelots excavated by German geologists Wilhelm Reiss and Alphons Stübel at the necropolis of Ancón, Peru in 1875 ... Twenty-eight individual gravelots ... are identified in the holdings of the National Museum of Ethnology in Berlin, Germany"–Abstract.