Professional Associations
- American Association of Professional Landmen
- Houston Association of Lease and Title Analysts
- Houston Association of Division Order Analysts
Government Websites
- Texas County Clerks Office
- Texas General Land Office
- Louisiana Department of Natural Resources
- Louisiana Clerks of Court
- SONRIS (Louisiana)
- Railroad Commission of Texas
- Oklahoma Corporation Commission
- Minerals Management Service
Industry Associations
- American Petroleum Institute
- Independent Petroleum Association of America
Oil & Gas History Websites
- Museums (by state)
- American Oil and Gas Historical Society