I found this article about mineral resources on Crow Lands in...

I found this article about mineral resources on Crow Lands in Montana. It is an old article but still interesting to read about the prospectivity of oil and gas on Crow lands. Oil section starts on page 32.

I didn’t realise that the Ash Creek field lay partly on Crow land in Montana. Figure 1 on page 77 shows it’s location.

http://www1.eere.energy.gov/tribalenergy/guide/pdfs/crow_7.pdf