Template:Ulrich, 1894

• Ulrich, E.O. 1894. The Lower Silurian Lamellibranchiata of Minnesota. In: E.O. Ulrich, W.H. Scofield, J.M. Clarke & N.H. Winchell (eds), Final Report of the Geological and Natural History Survey of Minnesota, vol. 3, part 2, The Geology of Minnesota. Paleontology. p. 475–628, pl. 35–46. BHL  
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