Cadastral Survey is an operational program within the Bureau of Land Management, Department of the Interior, focused on legal boundary surveys for the Federal Government, stewardship of PLSS records, and the development of spatial data for national land information systems. The program documents and maintains primary land tenure records such as survey field notes and plats, with offices in multiple western states and Washington, D.C. It emphasizes historical and methodological aspects of determining land ownership and boundaries, blending research, field measurement, and archival interpretation. The site serves professionals involved in land surveying and cadastral data management in the United States.