Publishers’ Catalogues: http://www.lights.com/publisher/
PubMed: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi
Pulse Data International: http://www.pulsedata.co.nz/
Quid: http://www.quid.fr/
Random House: http://www.randomhouse.com/
Rebollar, Patrick (site): http://www.twics.com/~berlol/
REFER: http://www.refer.org/
Regroupement des aveugles et amblyopes du Montréal métropolitain (RAAMM): http://www.raamm.org/
RENATER: http://www.renater.fr/
Research Libraries Group (RLG): http://www.rlg.org/