Fredericks, G. N. (1924). Paleontological Notes. 2. On Upper Carboniferous spiriferids from the Urals [in Russian]. Izvestiâ Geologičeskogo Komiteta. 38: 295-324.
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Fredericks, G. N.
1924
Paleontological Notes. 2. On Upper Carboniferous spiriferids from the Urals [in Russian]