First ed., 1925, published in Geneva by the League of Nations International Committee on Intellectual Co-operation; 2d ed., 1931, published in Berlin by W. de Gruyter under the auspices of the International Institute of Intellectual Co-operation.

Third ed., 1952, issued in 2 volumes: v. 1, Science and technology, being Publication no. 863 of the United Nations Educational, Scientific and Cultural Organization, and Publication no. 247 of the International Federation for Documentation; v. 2, Social sciences, education, humanistic studies, being in the 2d series only.

Compilers: 1st-2d (1925-31) M. Godet (with J. Vorstius, 1931)--3d (1952- ) T. Besterman.