Collection search - NATIONAL PARKS OF CANADA ASSIGNMENT OF LEASES RENEWABLE IN PERPETUITY. REQUEST FOR LEGAL ADVICE IN CONNECTION WITH THE INTENDED CHANGE IN THE POLICY REGARDING THE ADMINISTRATION OF THE NATIONAL PARKS. WHETHER THE DEFENCE OF ULTRA VIRES IS EQUALLY AVAILABLE TO CROWN WITH RESPECT TO AN ACTION FOR SPECIFIC PERFORMANCE OF CLAUSE FOR PERPETUAL RENEWAL OF LEASE GRANTED AFTER 1930 NATIONAL PARKS ACT