  Our sample of giant radio-source candidates, published in Paper I (Machalski
et al. 2001), is updated and supplemented with further radio and optical data.
In this paper we present: (i) newly detected host galaxies, their photometric
magnitude, and redshift estimate for the sample sources not identified yet,
(ii) optical spectra and spectroscopic redshift for the host galaxies fainter
than about 18.5 mag taken with the Apache Point Observatory 3.5m telescope, and
(iii) the VLA 4.9 GHz total-intensity and polarised-intensity radio maps of the
sample members. In a few cases they reveal extremely faint radio cores
undetected before, which confirm the previously uncertain optical
identifications. The radio maps are analysed and the polarisation properties of
the sample sources summarised. A comparison of our updated sample with three
samples published by other authors implies that all these four samples probe
the same part of the population of extragalactic radio sources. There is no
significant difference between the distributions of intrinsic size and radio
power among these samples. The median redshift of 0.38 +/- 0.07 in our sample
is the highest among the corresponding values in the four samples, indicating
that the angular size and flux-density limits in our sample, lower than those
for the other three samples, result in effective detections of more distant,
giant-size galaxies compared to those detected in the other samples. This
sample and a comparison sample of `normal'-size radio galaxies will be used in
Paper III (Machalski & Jamrozy 2006) to investigate of a number of trends and
correlations in the entire data.
