1. COMSTOCK J.M., DIETZ R.D., MORROW1 J.R. (2004). The Peerless structure, Daniels County, northeastern Montana: A probable late Ordovician impact structure // Meteoritics & Planetary Science 39, Nr 5, 683-692
2. Jarmo Moilanen (2009). Impact Structures of the World.
3. D. Rajmon (2009).

Спутниковая фотография кратера из Google Earth.

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