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1967ApJ...148L..17R - Astrophys. J., 148, L17-L21 (1967)
High-resolution radio observations of an intense HII region in Cygnus X.
RYLE M. and DOWNES D.
Journal keyword(s):
Nomenclature: [RD67] DR 21 A (Nos A-C).
Simbad objects: 5