LOC - Library of Congress. Also worth visiting is the American Memory page which provides a good digitial selection of maps.

NARA - Natioanal Archives and Records Administration, an independent Federal agency, is America's national recordkeeper. Their mission is to ensure ready access to the essential evidence that documents the rights of American citizens, the actions of Federal officials, and the national experience.

NGS - The National Geodetic Survey (NGS) defines and manages the National Spatial Reference System (NSRS).

NOAA - National Oceanic and Atomospheric Administration. NOAA´s mission is to describe and predict changes in the Earth's environment, and conserve and wisely manage the Nation's coastal and marine resources.

Professional Organizations/Societies

ACSM - American Congress of Surveying and Mapping. Originally named the National Congress on Surveying and Mapping when it was founded in June 1941, the society sought to better coordinate the nation's surveying and mapping activities.

College and University Programs in Surveying - List compiled by American Congress of Surveying and Mapping, sorted by state.

NCEES -The National Council of Examiners for Engineering and Surveying (NCEES), commonly referred to as the "Council," is comprised of engineering and surveying licensing boards.

POB - Point of Beginning. On line magazine for the geomatics profession.

Professional Surveyor Magazine -Online version of Professional Surveyor Magazine with information on surveying, mapping, engineering and related geomatics fields

Other References

Cadastral.com - Privately supported reference providing information of interest to the land surveyor (also known as the Cadastral Surveyor) involved in the preservation and retracement of the Public Land Survey System (PLSS) in the United States.

Color Landform Atlas of the United States. - These maps are created from arrays of elevation data. The elevation data was derived from contour maps elsewhere, some is available from the USGS. Actual satellite images are also available on this site.

LSRP - Land Surveyor Reference Page. Private site with numerous links to articles, surveying equipment, professional organizations, state rules, regulations, and statues