Sentence:  Even in the middle Volga region some <WSD>kurgans</WSD> have central graves containing adult females, as at Krasnosamarskoe IV....The appearance of adult females in one out of five <WSD>kurgan</WSD> graves, including central graves, suggests that gender was not the only factor that determined who was buried under a <WSD>kurgan</WSD>. 
Meaning of the word marked with <WSD> tags:  A prehistoric burial mound once used by peoples in Siberia and Central Asia.