The preliminary dataset of catalog records for early modern dissertations contains 56316 catalog records, 38958 from the SUDOC catalog, 17358 from the general catalog of the BNF. We find that 12274 SUDOC records (31.51%) and 13796 BNF records (79.48%) list only one person as a contributor. While it is possible to find dissertations without an explicit designation of <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">praeses</hi> and <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">respondens</hi>, this is certainly not the rule for early modern dissertations. It seems that in these cases cataloguers simply picked one or the other as the only author of the work.