gbcrosswalk - Crosswalk Chinese GB Industry Classifications Across Years

Clean, build, and compose crosswalks between Chinese GB/T (Guobiao/Tuijian, the recommended national standard prefix) 4754 industry classification vintages. The package starts with the historical workflow for 1986, 1994, 2002, 2011, and 2017 and is designed so later source-document vintages can be added as additional adjacent pairwise crosswalks. It also includes GB/T 4754-2002 to International Standard Industrial Classification of All Economic Activities (ISIC) Revision 3 links and Harmonized System (HS) Combined product code to ISIC Revision 3 links.