Jon Haveman, Krannert School of Management, Purdue University, maintains this metasite of industry classification concordances and international data links for researchers pursuing empirical studies of international trade. Among Haveman's collection of Industry Concordances, ISIC, SITC, usSIC, HS, TSUSA, and NACE classifications are covered with detailed source and downloading information. Links to a variety of International Trade Data such as the Penn World Tables are also well-documented; recent additions to both resources are listed by month.