As the first significant anthropological descriptions of northeastern Siberia, the publications of the Jesup North Pacific Expedition, undertaken in the first years of the 20th century, marked not only the beginning of a new era of research in Russia. Jochelson's work The Yakut, for which he draw on results of his earlier fieldwork in that area, was an important milestone for Russian and North American anthropology that provides to this day a unique contribution to thoroughly understanding the cultures of the northeastern Siberia.