Faint extra-galactic radio sources and their optical identifications
DE RUITER(H R)
Faint extra-galactic radio sources and their optical identifications - Leiden Rijksuniversiteit 1978 - Pbk.vi p. + 131
Faint extra-galactic radio sources and their optical identifications - Leiden Rijksuniversiteit 1978 - Pbk.vi p. + 131