also List of Supreme Court of Canada cases (Dickson Court)R v Edwards Books and Art Ltd (1986) - later Sunday closing law decision McGowan v. Maryland'' (1961) - Contrary U.S Supreme Court decision on blue laws, holding that laws originally passed for religious reasons may nonetheless be constitutional if they can be shown to fulfill a secular purpose External links Big M Drug Mart Ltd. Big M Drug Mart Ltd. Big M Drug Mart Ltd. Big M Drug Mart Ltd. Sunday shopping History of Calgary