Leontiy Sivstov
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Leontiy Ivanovich Sivstov (1872-1919) was a church reader who lived in Unalaska. Along with Aleksey Yachmenev, who like Sivstov was Aleut himself, Sivstov accompanied Waldemar Jochelson on his 1909-1910 ethnological studies on the Aleut.

The original article can be found at: http://en.wikipedia.org/wiki/Leontiy_Sivstov.
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