173.20—Revocation of permits.
               		
               	 	
               	 	
               	 	               	 	               	 	               	 	               	 	
               	 	
    
         Any permit issued pursuant to this part may be revoked at any time within the discretion of the Secretary. Agricultural and grazing leases dealt with in  § 173.17 shall be subject to cancellation as provided for in the respective  parts 162 and 166 of this chapter, and the conditions of the instruments executed pursuant thereto.