Geography, Geology, & the Environment

• United States Geological Survey (USGS)

• National Geologic Map Database (MGMD)

• Pennsylvania Dept. of Conservation & Natural Resources: Geology 

• Geographic Names Information System (GNIS)

• Pennsylvania Spatial Data Access (PASDA)

• American Geophysical Union (AGU)
• The Geological Society of America (GSA)
• Pittsburgh Geological Society

• Earthchem Portal
  Provides access to geochemical and other rock sample data.
• ​USGS National Hydrography Dataset
  Consists of digital spatial data about surface water features such as lakes, ponds, streams, rivers, springs and wells.​

• Atmospheric Science Data Center
  Processes, archives, and distributes NASA Earth science data in the areas of radiation budget, clouds, aerosols, and tropospheric composition

• Geoscience Data Repository 
  The Geoscience Data Repository (GDR) is a collection of Earth Sciences Sector geoscience databases that is managed and accessed by a series of Information Services (GDRIS).

USA.gov is the official guide to U.S. Government information and services.

• The National Map

 Interactive, high-quality, topographic maps and digital data. Produced by the USGS.

Science.gov searches over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.