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The elements of astronomy; a textbook (1919)
Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 533
9 P.M. MAPT. … Magnitudes 0 1 2 S 4 5 Nebula ClusterSymbols #*** + • O 9 P.M. MAPT.Astronomy · Constellations
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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