1. Thong Do (2017). The Ughtasar Petroglyphs.
2. Monika Kumlehn de Mamani & Ingrid Grambow (2010). IMPAKTNAMEN: Namen der [Meteorite; Impakte/Krater; Boliden/Fireballs; Tektite] im Sonnensystem.

this crater filled with snow runoff was actually made by a meteor
(Thong Do, 2017).

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