U. S. Naval Observatory - General information, FAQ, tour information, history, equipment information, inexpensive digital astro imaging, and instructions on constructing an 8 inch Dobsonian. National Geodetic Survey - Provides information and products related to the definition and management of the National Spatial Reference System (NSRS) - the framework for latitude, longitude, height, scale, gravity, orientation and shoreline throughout the United States. BLM National Home Page - The Bureau of Land Management administers 264 million acres of public lands, located primarily in the 12 Western States, containing natural, historical, cultural, recreational, and economic resources. U.S. Geological Survey - The U.S. Geological Survey provides the Nation with reliable, impartial information to describe and understand the Earth. Florida Geomatics - Outlines programs and national, state and local resource links for land surveyors. Geoscience Australia - The national agency for geoscience research and geospatial information. Land Surveying and Geomatics: U.S. Federal - Discussion of U.S. Government resources for professional land surveyors. www.resurvey.org - Privately supported site established as a reference for land surveyors working in the public land survey system.