- The Mightier Hudson: The Spirited Revival of a Treasured Landscape
- The Lives of Dillon Ripley: Natural Scientist, Wartime Spy, and Pioneering Leader of the Smithsonian Institution
- Fairtide: Sailing Toward Long Island's Future
- Voyage of the Sanderling: Exploring the Ecology of the Atlantic Coast from Maine to Rio
- Tropical Forests and the Human Spirit: Journeys to the Brink of Hope