The advanced data infrastructure of CWTS, and in particular the in-house availability of both Clarivate Analytics' Web of Science database and Elsevier's Scopus database, enables CWTS to create the above-mentioned maps based on massive amounts of bibliographic data, sometimes involving several millions of scientific publications. In addition to the maps mentioned above, CWTS also produces all kinds of customized maps based on special requests from clients. Do not hesitate to contact us if you want to know more about the possibilities we have.