Permian flora of Petchora Basin - Part 2 - Sphenopsida Transactions
Neuburg, M.F.
Permian flora of Petchora Basin - Part 2 - Sphenopsida Transactions - 1 - 137 - British Regional Geology .
Permian flora of Petchora Basin - Part 2 - Sphenopsida Transactions - 1 - 137 - British Regional Geology .