Chowder’s written National Park Service films for:
- River Raisin National Battlefield Park — in progress (Monroe, Michigan)
- Cabrillo National Monument — in progress (San Diego, California)
- Tuskegee Airmen National Historic Site (Alabama)
- Ulysses S. Grant National Historic Site (Grantwood Village, Missouri)
- Appomattox Court House National Historical Park (Virginia)
- Lowell (Massachusetts) National Historic Park
- World War II Valor in the Pacific National Monument (Pearl Harbor, Hawaii)
- Klondike Gold Rush National Historical Park (Skagway, Alaska)
- Klondike Gold Rush National Historical Park (Seattle)
- Fort Donelson (Tennessee) National Battlefield (two films: one in 2002 and one in 2012)
- Fort Scott (Kansas) National Historic Site
- Gettysburg National Military Park (Pennsylvania)
- Fort McHenry National Monument and Historic Shrine (Maryland)
- Kings Canyon National Park (California)