Application and utility of a low-cost unmanned aerial system to manage and conserve aquatic resources in four Texas rivers - Birdsong, Timothy; Bean, Megan; Grabowski, Timothy; Hardy, Thomas B.; Heard, Thomas; Holdstock, Derrick; Kollaus, Kristy; Magnelia, Stephan; Tolman, Kristina (Journal of the Southeastern Association of Fish and Wildlife Agencies, 2015)