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745" on the longest edge
In Pleistocene North America
Split specimens are precision cut to reveal the interior spiral
The Grateful Dead Set List
Alcatraz Penitentiary - 3.019" Showcase Concrete rockinaboxalcatraz 745" on the longest edgeThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 3. 019" along the widest point. This specimen, from the famous Alcatraz Island, saw some 1,500 prisoners pass by it during the prison's operation. A certificate of authenticity is included.
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