Title & Authorization Documents
The BLM maintains a set of records called the Control Document Index. It consists of microfilmed copies of patents and deeds which convey title to and from the United States. It also includes microfilmed copies of documents which affect or have affected control, or limit or restrict the availability of right, title, or use of federal lands. The Control Document Index microfilm cards are arranged chronologically within the township and range.
To obtain copies of patents and deeds, the legal land description is required. At a minimum the township and range, section, and lot or aliquot part would also be needed in obtaining a copy of these records. Finally, the patent number and date, if known, are also helpful in these searches.