xBookUtils.terms['fn_13_501'] = "Dora L. Costa, “The Wage and the Length of the Work Day: From the 1890s to 1991,” Journal of Labor Economics 18, no. 1 (2000): 156–181.";
xBookUtils.terms['fn_13_502'] = "Otis W. Gilley and Marc C. Chopin, “Professional Golf: Labor or Leisure,” Managerial Finance 26, no. 7 (2000): 33–45.";
xBookUtils.terms['fn_13_503'] = "Many of the figures in this application were taken from Chris Kirkham and Andrew Khouri, “How Longshoremen Command $100K Salaries in Era of Globalization and Automation,” Los Angeles Times, March 1, 2015. The sector-level wage and earnings data are from the U.S. Bureau of Labor Statistics.";
xBookUtils.terms['fn_13_504'] = "http://www.bls.gov/news.release/history/ocwage_12202000.txt";
xBookUtils.terms['fn_13_505'] = "http://www.bls.gov/news.release/pdf/ocwage.pdf";
xBookUtils.terms['fn_13_506'] = "https://labor.ny.gov/stats/ins.asp";
xBookUtils.terms['fn_13_507'] = "https://apir.wisc.edu/degrees/BADegrees20052014.pdf";
xBookUtils.terms['fn_13_508'] = "http://www.brown.edu/about/administration/institutional-research/factbook/degrees-and-completions";