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1973IAUS...52...29L - IAU Symp., 52, held at the State University of New York at Albany, Albany, N.Y., USA, 29th May - 2nd June. Ed. by J.M. Greenberg, H.C. van de Hulst. " Interstellar dust and related topics"., 52, 29-30 (1973)
The ratio of total to selective extinction in the directions of selected planetary nebulae.
LUTZ J.H.
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Simbad objects: 6
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