United States
United States Bureau of Land Management: http://www.blm.gov/wo/st/en.html
Information on all federally owned lands, water bottoms, etc. Also all federal oil and gas leases and well information and production.
United States Minerals Management Service: http://www.mms.gov/offshore/
Federal owned mineral rights in offshore areas.
United States Government land patents: http://www.glorecords.blm.gov/
For locating United States Government land patents.
Eastern States Mineral Records: http://www.blm.gov/es/st/en/prog/minerals.html
Rocky Mountain
Colorado Bureau of Land Management: http://www.blm.gov/co/st/en.html
State Land Issues.
Colorado Oil and Gas Conservation Commission: http://cogcc.state.co.us/
Governing body for oil and gas activities (including permitting) in Colorado.
Colorado Oil and Gas Conservation Commission mapping: http://cogcc.state.co.us/infosys/Maps/gismain.cfm
Geological information systems for the Colorado OGCC.
Colorado Division of Wildlife: http://wildlife.state.co.us/
Colorado Secretary of State: http://www.sos.state.co.us/pubs/business/forms_main.htm
Corporate records and officers for all companies operating in the State of Colorado.
Colorado State Land Board (Office of State Lands): http://www.trustlands.state.co.us/
Information on all State-owned lands, oil and gas leasing, pipelines, patents, and township plats.
New Mexico Bureau of Land Management: http://www.blm.gov/nm/st/en.html
State Land Issues.
New Mexico Oil Conservation Division: http://www.emnrd.state.nm.us/ocd/
Governing body for oil and gas activities (including permitting) in New Mexico.
New Mexico State Land Office: http://www.nmstatelands.org/
Information on all State-owned lands, oil and gas leasing, pipelines, patents, and township plats.
Utah Bureau of Land Management: http://www.blm.gov/ut/st/en.html
State Land Issues.
Utah Bureau of Land Management Land Records: http://www.ut.blm.gov/LandRecords/landrecords.html
Source for Utah State Patents.
Utah Department of Natural Resources: http://naturalresources.utah.gov/
Information on oil and gas permitting.
Utah Trust Lands (State Land Office): http://www.trustlands.utah.gov/
Information on all State-owned lands, oil and gas leasing, pipelines, patents, and township plats.
Utah Trust Lands GIS mapping web site: ftp://lands-ftp.state.ut.us/pub/gisdata.htm
Southern Ute Tribe web site: http://www.southern-ute.nsn.us/
Arkansas
Arkansas Oil and Gas Commission: http://www.aogc.state.ar.us/
Arkansas Secretary of State: http://www.sosweb.state.ar.us/
Corporate records and officers for all companies operating in the State of Arkansas.
Alabama
Alabama State Oil and Gas Board: http://www.gsa.state.al.us/ogb/ogb.html
Mississippi
Mississippi State Oil and Gas Board: http://www.ogb.state.ms.us/
Texas
General Land Office of Texas Records: http://www.glo.state.tx.us/
Railroad Commission of Texas: http://www.rrc.state.tx.us/
General
AAPL: http://www.landman.org/
American Association of Professional Landmen, the association of Land Professionals.