From professional translators, enterprises, web pages and freely available translation repositories.
andrew shea, « border choices:
canada-us regional trade patterns," american economic review 85 (june 1995): 615-23; john m. curtis and shenjie chen, "trade costs and changes in canada’s trade pattern," forthcoming, 2003, and james e. anderson and eric van wincoop, borders, trade and welfare, working paper 8515 (cambridge, ma: