Search Results - Mamay, Sergius H., 1920-

Two new plant genera of Pennsylvanian age from Kansas coal balls / by Sergius H. Mamay. by Mamay, Sergius H., 1920-

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Two new plant genera of Pennsylvanian age from Kansas coal balls / Sergius H. Mamay. by Mamay, Sergius H., 1920-

Tinsleya, a new genus of seed-bearing callipterid plants from the Permian of north-central Texas / by Sergius H. Mamay. by Mamay, Sergius H., 1920-

Additions to the flora of the Spotted Ridge Formation in central Oregon / by Sergius H. Mamay and Charles B. Read. by Mamay, Sergius H., 1920-

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Tinsleya, a new genus of seed-bearing callipterid plants from the Permian of north-central Texas / by Sergius H. Mamay. by Mamay, Sergius H., 1920-

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Russellites, new genus, a problematical plant from the Lower Permian of Texas /by Sergius H. Mamay. by Mamay, Sergius H., 1920-

Paleozoic origin of the cycads / by Sergius H. Mamay. by Mamay, Sergius H., 1920-

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Occurrence and significance of marine animal remains in American coal balls / by Sergius H. Mamay and Ellis L. Yochelson. by Mamay, Sergius H., 1920-

Paleozoic origin of the cycads / by Sergius H. Mamay. by Mamay, Sergius H., 1920-

Additions to the flora of the Spotted Ridge Formation in central Oregon / by Sergius H. Mamay and Charles B. Read. by Mamay, Sergius H., 1920-, Read, C. B.

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Occurrence and significance of marine animal remains in American coal balls / by Sergius H. Mamay and Ellis L. Yochelson. by Mamay, Sergius H., 1920-, Yochelson, Ellis L. (Ellis Leon), 1928-2006

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Upper Paleozoic floral zones and floral provinces of the United States / by Charles B. Read and Sergius H. Mamay. With a Glossary of stratigraphic terms, by Grace C. Keroher. by Read, Charles Brian, 1907-

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