| 1. | W.H. Hass, USGS Numbered Series, Professional Paper 294, chapter J, pages 365-399, 1959 On Classification of Pridoli (Silurian)-Lochkovian (Devonian) Spathognathodontidae (Conodonts). W.H. Hass, USGS Numbered Series, Professional Paper 294, chapter J, pages 365-399, 1959 (en) On Classification of Pridoli (Silurian)-Lochkovian (Devonian) Spathognathodontidae (Conodonts). |