GeoRef (ProQuest)
Covering the geology of North America from 1693 and that of the rest of the world from 1933. Topics covered include geophysics and structural geology, economic geology, minerals and petroleum, palaeontology and stratigraphy, engineering and environmental geology, geomorphology, soils and quaternary geology, igneous and metamorphic petrology, hydrogeology, geochemistry, aerial geology and maps.