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| Title: | Where Is Planet X? | |
| Authors: | Littmann, Mark | |
| Publication: | Sky and Telescope, volume 78, page 596. (S&T Homepage) | |
| Publication Date: | 12/1989 | |
| Origin: | S&T; KNUDSEN; KNUDSEN | |
| Bibliographic Code: | 1989S&T....78..596L |
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