Radio and K-band obs. of Ultra-Steep sources
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https://b2find.eudat.eu/dataset/41b12a60-61da-5d19-8562-a41c45cb127e
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资源简介：
A sample of 76 ultra-steep spectrum (USS) radio sources is defined from the 843-MHz Sydney University Molonglo Sky Survey (SUMSS) and 1.4-GHz NRAO VLA Sky Survey (NVSS) radio...
