Walcott, C. D. (1902). Cambrian Brachiopoda: Acrotreta; Linnarssonella; Obolus; with descriptions of new species. United States National Museum, Proceedings. 25: 577-612.
482083
Walcott, C. D.
1902
Cambrian Brachiopoda: Acrotreta; Linnarssonella; Obolus; with descriptions of new species