Proper motions in the field of the open cluster NGC 6939 / R. D. Cannon and A. G. Purcell
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Superior document: | Royal Observatory bulletins 158 |
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VerfasserIn: | |
Place / Publishing House: | London : Science Research Council, 1970 |
Year of Publication: | 1970 |
Language: | English |
Series: | Royal Observatory bulletins
158 |
Physical Description: | S. 69 - 81; graph. Darst. |
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