GeoRef (ProQuest)
Established by the American Geosciences Institute, GeoRef provides access to the most comprehensive geoscience literature of the world. It includes references to all publications of the U.S. Geological Survey. Master's theses and doctoral dissertations from US and Canadian universities are included. Coverage for North American resources starts in 1669, and worldwide coverage in 1933.
Coverage Dates: 1669 - present