The Tribal Minor New Source Review (NSR) program applies to new and modified minor sources and minor modifications at major sources of air pollution in Indian country. The program, established in 2011, is implemented through issuance of preconstruction permits that can include, among other requirements, pollutant emission limits for minor sources and emission limitations on the potential of sources to emit pollution that would otherwise be considered major sources. This minor source program for Indian country is similar to state minor NSR programs. State minor NSR programs often use general permits and a few state programs allow permits by rule as streamlined permitting approaches for similar emission units or stationary sources. This action finalizes general permits for certain source categories of true minor sources wishing to locate or expand in Indian country. This action finalizes general permits for the following six source categories: concrete batch plants; boilers and emergency engines; stationary spark ignition engines; stationary compression ignition engines; graphic arts and printing operations; and sawmill facilities.