OpenGrey

OpenGrey – System for Information on Gray Literature in Europe

The OpenGrey is a multidisciplinary European database, covering science, technology, biomedical science, economics, social science and humanities

Document types include technical or research reports, doctoral dissertations, conference papers, official publications, and other types of grey literature.

The user is informed of the availability of the document and the conditions of access for paper documents from each supply centre.

Source
www.opengrey.eu