Title: The camping trip that changed America
Subjects: Travel, Environmentalism, National parks and reserves, History, Juvenile literature, Roosevelt, theodore, 1858-1919, Roosevelt, theodore, 1858-1919, juvenile literature, Muir, john, 1838-1914, National parks and reserves, united states, National parks and reserves, juvenile literature, Yosemite national park (calif.)
Places: United States, California, Yosemite National Park (Calif.), Yosemite Valley
People: John Muir (1838-1914), Theodore Roosevelt (1858-1919)