Patuxent Research Refuge Manager Brad Knudsen poses for a photo at the National Wildlife Visitor Center at the Patuxent Research Refuge in Laurel on Wednesday, Dec. 6, 2017. (Jen Rynda / BSMG)

Tour the Patuxent Refuge Central Tract with the former refuge manager, Brad Knudsen, and learn about the history, ecology, and research of this beloved Laurel treasure.