Survey Records Available from the Information Center
GLO/BLM Field Notes and Survey Plats, 1850-present. Field notes contain a complete description of each mile surveyed, every monument set, and every bearing tree scribed. Plats show graphic representation of information contained in the field notes.
Mineral Surveys, Field Notes and Plats 1850-present. Records of the mineral surveys approved by the General Land Office or the Bureau of Land Management for Colorado.
Tract books. These books note all transactions affecting public lands from the 1860's to July 1, 1965. The local land offices in Colorado maintained these books daily. A separate set of Tract Book's was maintained daily by the General Land Office in Washington DC. Microfilm of both sets are available in the Colorado State Office.
Historical Indexes (HI) and Master Title Plats (MTP). In 1965; the Tract Books were superseded by the Historical Index, a chronological listing of actions affecting land title. The HI's are maintained daily in the Colorado State Office. The graphical representation of the Historical Indexes is on the Master Title Plats. Both HI's and MTP's may be viewed from microfilm (aperture cards) in the Colorado State Office. Each BLM Field Office has copies of the HI's and MTP's for their area of responsibility.
Survey Records Online
For information available online, visit the BLM General Land Office Records Automation web site.