After , no permit, license, lease, or other authorization for the use of land within the Glacier National Park, Montana, for the erection and maintenance of summer homes or cottages shall be granted or made: , That the Secretary of the Interior may, in his discretion, renew any permit, license, lease, or other authorization for such purpose granted or made prior to .January 26, 19311931-01-26January 26, 19311931-01-26Provided, however