Beginning in 1940, Kosok was aided in Peru by Maria Reiche, a German translator and mathematician from Lima. She spoke five languages and aided in mapping the lines, as well as assessing how the massive figures might have been scaled up from smaller drawings or patterns. After Kosok left Peru in 1949, Reiche continued to study the Nazca Lines, soon mapping 18 more figures. She worked for the rest of her life to preserve the Nazca Lines and have them recognized until her own death in 1998 in Peru. In 1994 they were designated as a UNESCO World Heritage Site.