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The talks stalled amidst differences between the two sides over intellectual property rights and government procurement . In some studies , the criteria for sampling indoor air may require checking containers of volatile chemicals to make sure they are tightly closed or removing those products before samples are taken . " Italian Workers of the World explores the complex links between international class formation and nation building . No health comparison values for short-term ( e.g ., less than two weeks ) or intermediate ( e.g ., between two weeks and less than one year ) exposure were exceeded at any location . The average air concentrations of acetone at all four sampling locations exceeded typical outdoor background air concentrations , but were well below air comparison values for short-term , intermediate , and long-term exposure . Economists who are members of other departments at Cornell and visiting professors from other universities also teach Econ courses .