This case presents the question whether the State of Montana may tax the Blackfeet Tribe's royalty interests under oil and gas leases issued to non-Indian lessees pursuant to the Indian Mineral Leasing Act of 1938, ch. 198, 52 Stat. 347, 25 U. S. C. § 396a et seq. (1938 Act).
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Respondent Blackfeet Tribe filed this suit in the United States District...
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