Foraminifera source request
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Mello, J. F. (1969). Foraminifera and stratigraphy of the upper part of the Pierre Shale and lower part of the Fox Hills Sandstone (Cretaceous), north-central South Dakota. Professional Papers US. Geological Survey. 611:i-iv, 1-121.
Mello, J. F. (1969). Foraminifera and stratigraphy of the upper part of the Pierre Shale and lower part of the Fox Hills Sandstone (Cretaceous), north-central South Dakota. Professional Papers US. Geological Survey. 611:i-iv, 1-121.