Economic exchange as the requisite basis for royalty ownership of value added in natural-gas sales Author Brätland J. Journal/Series Natural Resources Journal | Vol. 41(3); 685 - 711; 27 p. Date 2002 Source IUCN (ID: ANA-067879) Publisher | Place of publication University of New Mexico School of Law | Albuquerque, NM, USA Document type Article in periodical Language English Country/Territory United States of America Subject Mineral resources Keyword Subsidy/incentive