Diedrich, C.G., 2012. Late Pleistocene Crocuta crocuta spelaea (Goldfuss 1823) populations from the Emscher River terrace open air hyaena den near Bottrop and other sites in NW Germany: Their bone accumulations along rivers in lowland mammoth steppe envirnoments and scavenging activities on woolly rhinoceros. Quaternary International 276-277: 93-119
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