siccode - SERP Analysis

https://siccode.com/

https://www.osha.gov/data/sic-search

https://www.sec.gov/search-filings/standard-industrial-classification-sic-code-list

https://www.naics.com/everything-sic/

https://en.wikipedia.org/wiki/Standard_Industrial_Classification

https://wise.com/us/sic-code/

https://www.investopedia.com/terms/s/sic_code.asp