Sourcing of obsidian artefacts from the Omolon River basin and the neighbouring region (north-eastern Siberia) : prehistoric procurement from Kamchatkan and Chukotkan sources - Kuz'min, Jaruslav Vsevolodovič; Vorobei, I. E.; Glascock, Michael D.; Grebennikov, Andrei V. (Oxford University, Research Laboratory for Archaeology and the History of Art, 2021)