Classification. : Class P, subclass PT, part 2: Dutch and Scandinavian literatures.

Mode of access: Internet.

Traffic analysis by geography and subject.

Mode of access: Internet.

Outline of the Library of Congress classification.

Earlier editions were issued by the Classification Division of the Library of Congress under title: Classification. Outline scheme of classes.

Catalogue of scientific papers, 1800-1900 : subject index.

Each volume contains a list of the serial publications indexed, with the abbreviations used, and the libraries where the serials can be consulted, followed by the schedule of classification.