The proper motions of 2088 stars and the motion of the open cluster Messier 67, derived from photographic plates taken by prof. dr. E. Hertzsprung at the Potsdam Observatory / measured and discussed by P.J. van Rhijn
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The proper motions of 2088 stars and the motion of the open cluster Messier 67, derived from photographic plates taken by prof. dr. E. Hertzsprung at the Potsdam Observatory / measured and discussed by P.J. van Rhijn
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The proper motions of 2088 sta ...... ung at the Potsdam Observatory
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The proper motions of 2088 sta ...... nd discussed by P.J. van Rhijn