An optical spectroscopic survey of the 3CR sample of radio galaxies with z < 0.3 - III. Completing the sampleS. Buttiglione, A. Capetti, A. Celotti, D. J. Axon, M. Chiaberge, F. D. Macchetto and W. B. SparksA&A, 525 (2011) A28DOI: https://doi.org/10.1051/0004-6361/201015574