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- Yap (Micronesia) (1)
- Yeats, W. B. (William Butler), 1865-1939 (1)
- Yeats, William Butler, 1865-1939 (1)
- Yellowstone National Park (1)
- Yerkes Observatory (2)
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- Yntema, Theodore O. (Theodore Otte), 1900- (1)
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