North Dakota
NDIC
https://www.dmr.nd.gov/oilgas
ND - Webmapper
https://www.dmr.nd.gov/OaGIMS/viewer.htm
ND State Lands Dept.
http://www.land.nd.gov/minerals/
ND Petroleum Council
http://www.ndoil.org/
ND Geological Survey
https://www.dmr.nd.gov/ndgs/Resources/WBPetroleumnew.asp
ND Recorder's Information Network
http://www.ndrin.com/
Montana
Montana Board of Oil & Gas
http://bogc.dnrc.mt.gov/
MT State Minerals Management
http://dnrc.mt.gov/Trust/MMB/OG/Default.asp
Montana Oil & Gas - Webmapper
http://www.bogc.dnrc.mt.gov:4899/website/mtcbm/viewer.htm
Montana Cadastral
http://svc.mt.gov/msl/mtcadastral/
Federal
BLM - Montana & Dakotas
http://www.blm.gov/mt/st/en.html
BLM - LR2000 Public Records
http://www.blm.gov/lr2000/index.htm
USGS
http://www.usgs.gov/