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<http://webisa.webdatacommons.org/427104984>	<http://www.w3.org/ns/prov#value>	"In states with strong unions, such as Wisconsin, note the authors, ???district insurance costs can be very expensive.??? With the passage of Governor Scott Walker???s proposed Act 10 into law, Wisconsin can be seen as a ???natural experiment in changing teacher union strength,??? they state." .