Helpful Links:
National Society of Insurance Premium Auditors - www.NSIPA.org
NCCI - www.ncci.com
Secretaries of State - http://www.coordinatedlegal.com/SecretaryOfState.html
State Specific Rules
California - https://www.wcirb.com/class-search
Delaware - http://www.dcrb.com/dcrb/manuals/Files/manuals/de_basic_manual_6-1-10.pdf
Massachusetts - https://www.wcribma.org/mass/ToolsAndServices/MACI/Main.aspx
Michigan - https://caom.com/Portals/0/MWCPF%20Basic%20Manual%20v201911_5.pdf
Minnesota - https://www.mwcia.org/OnlineServices/MCISearch.aspx
New Jersey - https://www.njcrib.com/Search/ViewPDFByName?documentTitle=Manual&share=Manual&extension=pdf
New York - https://digitallibrary.nycirb.org/digital-library/public/
North Carolina - https://www.ncrb.org/digitallibrary/basicmanual/#t=Preface.htm
Pennsylvania - http://www.dcrb.com/pcrb/manuals/Files/manuals/pa_basic_manual_1-1-19.pdf
Wisconsin - https://www.wcrb.org/class-code-lookup/