The American Geographical Society is an organization of professional geographers, founded in 1851 in New York City. Most fellows of the society are Americans, but among them have always been a significant number of fellows from around the world.
The American Association of Geographers is a non-profit scientific and educational society aimed at advancing the understanding, study, and importance of geography and related fields.
NCDC provides the historical perspective on climate. Through the use of over a hundred years of weather observations, reference data bases are generated. NCDC contains a very large archive of climatic data.
The USGS provides a wealth of scientific data and publications on natural resources, natural hazards, and the landscape of the United States. Its open-access resources are invaluable for researchers in geology, hydrology, and environmental science, offering comprehensive data and analysis tools.