"In 1965, Hydrokop, a chemical mining enterprise based in Krakow, was commissioned by the Auschwitz-Birkenau State Museum to carry out geological tests at Birkenau aimed at determining the locations of incineration pits and pyres. Specialists of Hydrokop bored 303 holes up to 3 m deep. Traces of human ashes, bones, and hair turned up in 42 sites. Documentation of all the holes and the diagrams of their distribution are preserved in the Conservation Department of the Museum." (Franciszek Piper, Anatomy of the Auschwitz Death Camp, p. 179n).
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