Mont. Code § 85-7-1956
No contract shall be made with the United States hereunder except upon approval of a majority of those voting on the question at an election conducted pursuant to 85-7-1710, provided that the voting majority must own at least 50% of the acreage included within the district, or upon a petition signed by at least 60% in number and acreage of the holders of title or evidence of title to the lands included within the district. Such petition shall be addressed to the board of commissioners, shall set forth the aggregate amount of money to be borrowed from the United States and the purpose or purposes thereof, shall have attached thereto an affidavit certifying the signatures to said petition, and shall be filed with the secretary of the board of commissioners. Such petition may consist of one or more parts or papers.
§ 85-7-1956, MCA