EMILIO M. GARZA, Circuit Judge:
Plaintiffs Dunn-McCampbell Royalty Interest, Dunn-Padre Corporation, and McCampbell Minerals (collectively "Dunn-McCampbell") appeal the district court's grant of summary judgment in the companies' action challenging the regulatory authority of the National Park Service.
I
P.F. Dunn once owned both the land and mineral rights to a long stretch of barrier islands in Texas, now known collectively as Padre Island. In...
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