This definition appears somewhat frequently
See other definitions of MAST
Samples in periodicals archive:
The Midwest Alliance of Sovereign Tribes (MAST) represents 35 sovereign tribal nations of Minnesota, Wisconsin, Iowa, and Michigan.
Midwest Alliance of Sovereign Tribes Impact Week Mar 23, 2014 - Mar 26, 2014 Washington, DC Tribal Interior Budget Council Meeting Mar 24, 2014 - Mar 25, 2014