NASA. Observing solar prominences from the MONT WILSON obser - Lot 3

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NASA. Observing solar prominences from the MONT WILSON obser - Lot 3
NASA. Observing solar prominences from the MONT WILSON observatory. Circa 1930. Silver print. Caption on back "MONT WILSON OBSERVATORY, B15, Prominence 80,000 miles high, August 21, 1909, H(alpha) Hydrogen".19,2 x 24,4 cm with margins.
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