General Land Office Township Plats
- Plats (maps) of the public land survey (PLSS) of the United States are a valuable resource for original land survey information, as well as for understanding landscape history. The work was done using the Public Land Survey System (PLSS), which divides land into six-mile square townships and one-mile square sections. It established the township, range and section grid; the pattern upon which land ownership and land use is based. The aim of the survey was to divide the land into lots that could be sold, or otherwise divested, to raise funds for the federal government and to encourage settlement. In general, this work took place near the end of the 18th century and throughout the 19th century. Survey dates for specific plats vary depending on the state/region. The survey work was done by the General Land Office (GLO), an agency of the Treasury Department until 1849 and thereafter a part of the Interior Department. In 1946, the GLO was merged with the Grazing Service to create the modern Bureau of Land Management (BLM), which continues to have responsibility for the Public Land Survey on public domain lands. The original surveys are often referred to as the Public Land Survey or the General Land Office Survey.
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- Cadastral maps