
- British Library Document Supply Service
- GeoScienceWorld - Earth Science publications from c30 publishers
- Google Scholar
- Lyell Collection - Geological Society publications only
- MinAbs online - search abstracts from Mineralogical Abstracts between 1982 and 2008
- OnePetro - petroleum, oil and gas only. Articles can be downloaded from this site for a fee, but abstracts are free
- SAO/NASA Astrophysics Data System (ADS) - while mainly covering astronomy/astrophysics, this is useful for geochemistry & tectonics
- ScienceResearch.com
- SciTech Connect - citations and documents are made publicly available by the U.S. Department of Energy (DOE) including science information previously searchable in the Energy Citations Database and the Information Bridge
- WorldWideScience