century, the GLO shifted from a primary function of land sales to issuing leases and collecting grazing fees for livestock raised on public lands, and royalties from minerals off lands recently withdrawn from disposal under the Withdrawal Act of 1910, as well as other custodial duties. Thus, beginning around 1900, the GLO gained a focus for conservation of renewable public resources, as well as for their exploitation. On July 16, 1946, the GLO was merged with the United States Grazing Service (established in 1934 under the Taylor Grazing Act) to become the Bureau of Land Management (BLM), an agency of the Interior Department responsible for administering the remaining of public lands still in federal ownership. An early commissioner was John McLean, later an Associate Justice of the Supreme Court of the United States. The BLM makes images of GLO records (federal land patents, survey plats and field notes, land status records, and tract books) issued between 1787 and present publicly available on its website. Since 1990, the BLM's Geographic Coordinates Database (GCDB) program has endeavored to generate coordinate values for each established PLSS corner using the official survey records of the GLO and BLM on a township basis. The GCDB data are available for download by the public in GIS shapefile format from the GeoCommunicator Land Survey Information System website. The GCDB coordinates are also available to the public in the GCDB flat file and GCDB coverage formats via the National Operations Center website. Gallery See also List of Commissioners of the General Land Office Beginning Point of the U.S. Public Land Survey Beginning Point of the Louisiana Purchase Survey National Irrigation Congress References Further reading External links General Land Office Records: The Official Federal Land Records Site , at Bureau of Land Management Defunct agencies of the United States government Surveying of the United States Real estate in the United States Government agencies established in 1812 1812 establishments in the United States 1946 disestablishments in the United States Government agencies disestablished in 1946 Surveying organizations United States Department of the Interior agencies