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LA Tar Pits-6

Volunteer Mary Friedman helps excavate a bison skull in a paleontological lab at the George C. Page Museum at the La Brea Tar Pits on Wednesday, Oct. 23, 2013, in Los Angeles. On Monday, Oct. 28, 2013 the museum celebrates a century of excavation at the La Brea Tar Pits, considered the richest and most diverse collection of Ice Age fossils. (AP Photo/Jae C. Hong)