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Find a Wikipedia image that answers this question: What material was used to make the border on the ground surrounding the flag pole and cannon at Mt. Albion Cemetery?

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Represent the given Wikipedia image with related text information: Civil War Veterans Lot at Mt. Albion Cemetery Civil war veteran lot with cannon and flag pole at Mt. Albion Cemetery.

['<|image_1|>\nRepresent the given Wikipedia image with related text information: United States Colored Troops Memorial Statue in Lexington Park, Maryland, front view. United States Colored Troops Memorial Statue located in John G. Lancaster Park, Lexington Park, Maryland.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: MOUNT PLEASANT COLLEGIATE INSTITUTE HISTORIC DISTRICT, CABARRUS COUNTY SEVERAL MID-19TH-CENTURY BUILDINGS OF THE WESTERN CAROLINA MALE ACADEMY ESTABLISHED IN 1852. THE HANDSOME THREE-STORY MAIN BUILDING IS NOW THE EASTERN CABARRUS HISTORIC MUSEUM.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Oak Hill Memorial Park (4187423756).\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: World War One Memorial, Barre, VT, USA World War One Memorial, Barre, Vermont, Washington County, USA.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Civil War memorial, Woonsocket, Rhode Island full Civil War memorial, Woonsocket, Rhode Island.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Gouverneur K. Warren Gettysburg statue Statue of en:Gouverneur K. Warren at Gettysburg National Military Park. Photograph donated to Wikipedia by Donald Wiles.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Castle Rock near Camp Douglas, WI "Castle Rock" - formation visible from Interstate 90/94, near Exit 55, across from Camp Douglas, Wisconsin.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Richard Oglesby Monument Lincoln Park Chicago 2019-2408.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Montijuïc Cemetery.\n', "<|image_1|>\nRepresent the given Wikipedia image with related text information: Soldiers' and Sailors' Monument Manhattan central structure at dusk The Soldier's and Sailors' Monument in Riverside Park on Riverside Drive at West 89th Street in the Upper West Side honors the dead of the Civil War, and was designed by Stoughton & Stoughton with Paul E. M. DuBoy.\n", '<|image_1|>\nRepresent the given Wikipedia image with related text information: MonroeCT CenterHD4 Monroe Center Historic District, Monroe, Connecticut. Masonic hall.\n']
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