Conrad Gessner (Gesner) issued from Zurich Pandectarum sive Partitionum universalium libri XXI. Pandectarum was the first general subject index, which Gessner intended as a key to his Bibliotheca Universalis (1545).
"Gesner's bibliographical system with its division of knowledge into various categories represents an enlarged version of the medieval system, adapted to his own times" (Breslauer & Folter, Bibliography: Its History and Development  no. 16).
Besterman, The Beginnings of Systematic Bibliography 2nd ed (1940) no. XVII.