With oil prices stranded below $70, few oil and gas companies are rushing headlong into big offshore projects in frontier regions.

Due to the lack of schools in the frontier regions where his family had lived, he received only a limited education.

They were often a variety of token intended to alleviate a shortage of small change in growing frontier regions.

Shape-note singing became a fundamental part of camp meetings in frontier regions.

Many notes describe the natural resources and potential for settlement of frontier regions.