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1989IAUS..131..170G - 131st Symposium of the IAU held in Mexico City, Mexico, October 5-9, 1987. Ed S. Torres-Peimbert. Planetary Nebulae, 131, 170 (1989)
H2 and H I emission line imaging of the Ring Nebula NGC 6720.
GREENHOUSE M.A., HAYWARD T.L. and THRONSON H.A.
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Simbad objects: 1
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