Yen Le

• Barriers to the Wilderness Next Door
• Big Cypress National Preserve ORV Permit Holder/Camp Owner Visitor Study, Spring 2007 (Visitor Services Project, Report 184.2)
• Big Cypress National Preserve Visitor Study, Spring 2007 (Visitor Services Project, Report 184.1)
• Congaree National Park Visitor Study
• John Day Fossil Beds National Monument visitor study
• Yellowstone National Park Visitor Study