Campbell, K. S. W. (1961). New species of the Permian spiriferoides Ingelarella and Notospirifer from Queensland and their stratigraphic implications. Palaeontographica Abteilung A. 117(5-6): 159-192.
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Campbell, K. S. W.
1961
New species of the Permian spiriferoides Ingelarella and Notospirifer from Queensland and their stratigraphic implications