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Mamay Sergius H. 1920-
ID:
1386004
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Mamay Sergius H. 1920-
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Additions to the flora of the Spotted Ridge Formation in central Oregon
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Occurrence and significance of marine animal remains in American coal balls
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Paleozoic origin of the cycads
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Tinsleya, a new genus of seed-bearing callipterid plants from the Permian of north-central Texas
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Two new plant genera of Pennsylvanian age from Kansas coal balls
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