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Directory Results for 990 Return of Organization Exempt From Income Tax Under section 501 (c) , 527 , or 4947( a)(1) of the Internal Revenue Code (exce p t black lun g benefit trust or private foundation) Department of the T easury 10 The or anization ma y have to 990 Return of Organization Exempt From Income Tax Under section 501 (c), 527, or 4947(a)(1) of the Internal Revenue Code (except black lung benefit trust or private foundation) Department of the Treasury Int e rn a l R e v e nue Se rvi ce A