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In page Myra Keen:

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In 1975, Keen was invited to meet with Emperor Hirohito of Japan. He was a collector of shells, and had sent Keen specimens. The two also exchanged papers. When he visited in 1975 the two met in San Francisco, where they discussed their shared interest of shells and invertebrates.[3] Keen's graduate students included the Japanese Paleontologist and Malacologist Katsura Ōyama from 1955 to 1957.[citation needed]