Find literature published worldwide in geology; includes journal articles, books, maps, conference papers, reports and theses. Covers North America from the 17th century to present and the rest of the world from 1933 to the present.
The U.S. Geological Survey provides the Nation with reliable, impartial information to describe and understand the Earth. This information is used to: minimize loss of life and property from natural disasters; manage water, biological, energy, and mineral resources; enhance and protect the quality of life; and contribute to wise economic and physical development.
Searchable database of USGS reports and thematic maps. Contains more than 69,000 USGS bibliographic citations, including USGS numbered series begun as early as 1880. Many recent documents are available full text.
Their mission: "“To serve the citizens of Pennsylvania by collecting, preserving, and disseminating impartial information on the Commonwealth's geology, geologic resources, and topography in order to contribute to the understanding, wise use, and conservation of its land and included resources.”