Neutral atomic-carbon quasar absorption-line systems at z> 1.5 - Sample selection, H i content, reddening, and 2175 Å extinction featureC. Ledoux, P. Noterdaeme, P. Petitjean and R. SrianandA&A, 580 (2015) A8DOI: https://doi.org/10.1051/0004-6361/201424122