"How do you explain to a 2-year-old or 4-year-old there's nothing to eat?" asks Kathy, a homeless mother. Michael Nye hide caption

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This Ansel Adams photograph of Acoma Pueblo, N.M., is among those now on display, decades after being commissioned. Ansel Adams/National Archives hide caption

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Jim Marshall shot photos for more than 500 album covers. Jim Britt hide caption

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The cover of Sw!pe Volume 1. Cover art by Jack Laughner, type and design by Christopher D. Boynton Sw!pe/Red Hook Editions hide caption

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Staff Sgt. Norman T. Hatch was a cinematographer and combat photographer during World War II. He won an Academy Award for his footage of the amphibious assault at the Battle of Tarawa in 1943. U.S. Marine Corps Combat Correspondents Association hide caption

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Dr. Martin Luther King Jr. is sprawled across a police desk as his wife looks on. He was arrested while trying to attend a hearing for civil rights leader Ralph Abernathy and was released when his identity became known to the police. Montgomery, Ala., 1958 Charles Moore/Black Star hide caption

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Smoke and ash engulf the area around the World Trade Center. See a gallery of aerial images from Sept. 11. Greg Semendinger/NYPD via ABC News/AP hide caption

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An elder of the Fundamentalist Church of Jesus Christ of Latter-Day Saints (FLDS) poses with his family, including his 5 wives. See a gallery of Stephanie Sinclair's photos. Stephanie Sinclair/National Geographic hide caption

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James Dean walks through a rainy Times Square. Dennis Stock/Magnum Photos hide caption

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