American species of Operculina and Heterostegina and their faunal relations; A new species of Orthophragmina from Louisiana (Q135453)

From geokb
American species of Operculina and Heterostegina and their faunal relations; A new species of Orthophragmina from Louisiana; 1921; PP; 128-E; USGS NUMBERED SERIES; Shorter contributions to general geology, 1920; Cushman, J. A.
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American species of Operculina and Heterostegina and their faunal relations; A new species of Orthophragmina from Louisiana
American species of Operculina and Heterostegina and their faunal relations; A new species of Orthophragmina from Louisiana; 1921; PP; 128-E; USGS NUMBERED SERIES; Shorter contributions to general geology, 1920; Cushman, J. A.

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