Template:Amsden, 1983a
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- Amsden, T.W. 1983. The Late Ordovician brachiopod genera Lepidocyclus and Hiscobeccus. In T.W. Amsden & W.C. Sweet, Upper Bromide Formation and Viola Group (Middle and Upper Ordovician) in eastern Oklahoma. Oklahoma Geological Survey Bulletin 132: 36–44. PDF