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1989PASP..101..631Z - Publ. Astron. Soc. Pac., 101, 631-639 (1989)
A multicolor optical survey of QSOs to B=21.8 in the Hercules field.
ZHAN Y., KOO D.C. and KRON R.G.
Journal keyword(s):
Nomenclature: Table 1: [ZKK89] NN (Nos 1-30)
Simbad objects: 31
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