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Investigations representing the departments. Astronomy and astrophysics .. (1903)
University of Chicago · Chicago : The University of Chicago Press · leaf 412
I PflMBlliT ffflff ilii 1 … i 1 r^w ; : ., . ,.ii:. L , 1 kui^m . 1, 1 . ■ ! i 1 is» Schj.(IV) Sun(III 74 SrhJ.(IV) Fig. 1. Blue Region 5100 5200 5300Astronomy
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