Written and Directed by
Original Music by
Online Editor and Colorist
Archival Materials Courtesy of
The Academy of Natural Sciences,
Ewell Sale Stewart Library and the Albert M. Greenfield Digital Imaging Center for Collections
American Museum of Natural History Library
Cornell University Library, Making of America Digital Collection
Denver Public Library, Western History Collection
Grand Canyon National Park Museum Collection
Ernst Mayr Library of the Museum of Comparative Zoology, Harvard University
Library of Congress, Prints & Photographs Division
Montana Historical Society Research Center
Still Picture Records Section, National Archives at College Park
Photography Collection, Miriam and Ira D. Wallach Division of Art, Prints and Photographs,
The New York Public Library, Astor, Lenox and Tilden Foundations
Rhoda Knight Kalt
Smithsonian Institution Archives
U.S. Geological Survey
Utah State Archives
Othniel Charles Marsh papers, Manuscripts and Archives, Yale University Library
Peabody Museum of Natural History, Yale University, New Haven, Connecticut, USA
The Academy of Natural Sciences
Como Bluff, Booth Land & Livestock
Cumbres and Toltec Scenic Railroad
Dinosaur National Monument
Fossil Butte National Monument
Ghost Ranch Conference Center
Morrison Natural History Museum
National Museum of Natural History, Smithsonian Institution
University of Pennsylvania
University of Pennsylvania Museum of Archaeology and Anthropology
Peabody Museum of Natural History, Yale University
Julia Farwell and Walter Clay
Rhoda Knight Kalt
James E. Dunford
A MDTV Productions film for AMERICAN EXPERIENCE
WGBH Educational Foundation
All rights reserved.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
The story of Native peoples’ valiant resistance to expulsion from their lands and the extinction of their culture.
Vivid memories of those trapped in the terrifying temblor of 1906 that killed thousands of Californians.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.
Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
The American effort to relieve starvation in Soviet Russia in 1921 during the worst natural disaster in Europe in 500 years.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.