This index holds around 1,645,000 entries sourced from the Bureau of Land Management (BLM) under the U.S. Department of the Interior. These records are crucial in discovering legal land descriptions and property transfers from the federal government to private landowners. They detail who received which land from the government and the date of acquisition. The records draw from various sources, including homesteads, cash sales, warrants, private land claims, swamp lists, state selections, and railroad lists.