Grey literature is one term for materials and research produced by organizations or people outside the traditional commercial/journalistic or academic publishing worlds. Common forms of grey literature include government reports, research reports produced by organizations, conference proceedings, and white papers. Grey literature is generally written by and for professionals in a field, and typically employs technical and formal language. Because it is produced without the delays and restrictions of academic publishing, it is often more current than academic literature. It is not typically peer reviewed. Quality can vary greatly depending on the source, so always evaluate your sources carefully.
Grey literature for sustainable resource management may include reports and data from US government sources, international governments, intergovernmental organizations (such as the United Nations), non-governmental organizations (NGOs), and other sources.