f their bibliographic investigations. As a result, a
movement has occurred in all countries, especially
Germany, the United States and England, for the
expansion and improvement of libraries and for
an increase in their numbers. Publishers have been searching for new, more flexible, better-illustrated,
and cheaper forms of publication that are better-coordinated with each other. Cataloguing enterprises
on a vast scale have been carried out, such as the
International Catalogue of Scientific Literature and