Yakovlev, N. 1939. Echinodermata. Pp. 64-70 in Gorsky, I. (ed.) The Middle and Upper Carboniferous. The Atlas of the Leading Forms of the Fossil Faunas of USSR, The Central Geological and Prospecting Institute 5, 64-70.
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Yakovlev, N.
1939
Echinodermata. Pp. 64-70 in Gorsky, I. (ed.) The Middle and Upper Carboniferous. The Atlas of the Leading Forms of the Fossil Faunas of USSR