Faas, A. V. 1941. Echinoidea. Pp. 72-75 in L. Librovitch (ed.) The Atlas of the Guide Forms of the Fossil Faunas of the U.S.S.R. Volume IV. Lower Carboniferous Moscow/Leningrad.
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Faas, A. V.
1941
Echinoidea
The Atlas of the Guide Forms of the Fossil Faunas of the U.S.S.R