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Helen Tappan
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Foraminiferal genera and their classification
Alfred R. Loeblich, Alfred R. Loeblich Jr., Helen Tappan · Springer
1900 sayfa · 1988
Classification / Foraminifera
The paleobiology of plant protists
Helen Niña Tappan · W. H. Freeman
1028 sayfa · 1980
Micropaleontology / Paleobotany / Protista / Unicellular organisms
Foraminifera from the Arctic slope of Alaska
Helen Niña Tappan · U.S. Govt. Print. Off.
150 sayfa · 1951
Fossil Foraminifera / Fossils / Paleontology
Treatise on Invertebrate Paleontology. Part C Vol. 2
Alfred R. Loeblich, Jr., and Helen Tappan · Geological Society of America
398 sayfa · 1964
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