The final important rivalry between the cities during Alberta's early years was over economic leadership, especially in the Oilpatch. Calgary's nearby Turner Valley deposits were discovered in 1914, decades before Edmonton's Leduc #1 field in 1947. This in part accounts for the much larger concentration of head offices of large corporations in Calgary. Edmonton's business community contains more private corporations working in oil and gas, consulting and smaller operations. Edmonton is also the research and manufacturing centre of the Canadian petroleum industry, and roughly 80% of Canada's oil production is sent to market through Refinery Row, located just east of the city in Strathcona County.