Devils Tower Natural History Association (DTNHA) is a tax-exempt, not-for-profit corporation dedicated to supporting the historical, educational and interpretive activities of the National Park Service. DTNHA’s mission is to promote understanding and conservation of the natural, cultural and historical resources of the monument through education, public information, and service.

Yearly dues are $25.00 for associate memberships. One of the benefits of membership is a 15% discount on items sold by the association. Many other Cooperating Associations offer discounts to our members as well.