With his square, bulldoggish stature, signature rimless glasses, and inimitable smile--part grimace, part snarl--Theodore Roosevelt was an unforgettable figure, imprinted on the American memory through photographs, the chiseled face of Mount Rushmore, and, especially, film. At once a hunter, explorer, naturalist, woodsman, and rancher, Roosevelt was the quintessential frontiersman, a man who believed that only nature could truly test and prove the...