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Stone description: gray
| Wall Number | Country Sort ascending | State | Classification | Source |
|---|---|---|---|---|
| 7LB28 | United States | Kentucky | Sandstone | Taylor Co. |
| 9RA16 | United States | Minnesota | Limestone | St. Paul |
| 11C | United States | Indiana | Limestone | Lawrence Co. |
| 14RB3 | United States | Illinois | Dolomite | Chicago |
| 5LB35 | United States | Connecticut | Gneiss | Lyme |
| 6RA17 | United States | Pennsylvania | Sandstone | Greensburgh |
| 8LA6 | United States | New York | Limestone | Louisville |
| S2-4 | United States | Indiana | Limestone | Bedford |
| 10Lb19 | United States | Pennsylvania | Sandstone | Stoop's Ferry |
| 4RA17 | United States | Vermont | Marble | W. Rutland |
| 5RB40 | United States | South Carolina | Granite | Columbia |
| 7LB29 | United States | California | Sandstone | Livermore |
| 9RA31 | United States | Connecticut | Gneiss | Branford |
| 11La14 | United States | Iowa | Limestone | Charles City |
| 14RB48 | United States | Missouri | Limestone | Carthage |
| 5LB39 | United States | South Carolina | Granite | Charleston |
| 6RA26 | United States | Maine | Granite | Chesterville |
| S2-47 | United States | Vermont | Granite | Barre |
| 10LB22 | United States | Massachusetts | Gneiss | Monson |
| 12RA31 | United States | Maryland | Marble | Keedysville |
| 4RB20 | United States | New Hampshire | Granite | Mason |
| 5RB41 | United States | South Carolina | Granite | Fairfield Co. |
| 7LB32 | United States | Minnesota | Granite | Watab |
| 7Lb34 | United States | Connecticut | Gneiss | Sterling |
| 9RB11 | United States | Iowa | Limestone | Givin |
| 11LA21 | United States | Missouri | Limestone | Pleasant Hill |
| 15EE | United States | Indiana | Limestone | Bedford |
| 5LB40 | United States | South Carolina | Granite | Fairfield Co. |
| 6RA27 | United States | Maine | Granite | Brunswick |
| 8LB16 | United States | Mississippi | Limestone | Teshomingo County |
| S2-48 | United States | New Hampshire | Granite | Concord |
| 10LB25 | United States | Massachusetts | Gneiss | Northfield |
| 12RB20 | United States | Vermont | Marble | W. Rutland |
| 4RQ | United States | Ohio | Sandstone | Amherst |
| 5RB6 | United States | Ohio | Sandstone | Cumberland |
| 5EE | United States | Alabama | Limestone | Rockwood |
| 5RB8 | United States | Ohio | Sandstone | Independence |
| 7LB38 | United States | Maryland | Granite | Woodstock |
| 9RB22 | United States | Massachusetts | Granite | Worcester |
| 11LA27 | United States | Tennessee | Marble | Knoxville |
| 16B | United States | Maine | Granite | Frankfort |
| 5LB43 | United States | New Hampshire | Granite | Concord |
| 6RA35 | United States | Connecticut | Granite | Millstone Point |
| 8LB21 | United States | Ohio | Sandstone | Steubensville Jefferson Co. |
| S2-5 | United States | Missouri | Limestone | Carthage |
| 10LB27 | United States | North Carolina | Granite | Louisburg |
| 12RB30 | United States | New York | Marble | Chazy |
| 10LB29 | United States | Maine | Granite | St. Thomaston |
| 12RB38 | United States | Kentucky | Limestone | Taylorsville |
| 5LA10 | United States | Ohio | Sandstone | Sunbury |
| 5RQ | United States | Ohio | Sandstone | Kipton |
| 7LB41 | United States | Montana | Granite | Lewis & Clark Co. |
| 9RB23 | United States | Maine | Granite | Hurricane Isl. |
| 16EE | United States | Indiana | Limestone | Bedford |
| 5Lb44 | United States | New Hampshire | Granite | Concord |
| 6RA36 | United States | Connecticut | Gneiss | Gastonbury |
| 8LB24 | United States | North Carolina | Granite | Alamance Co. |
| S2-51 | United States | Maine | Granite | Frankfort |
| 10Lb31 | United States | Maine | Granite | W. Sullivan |
| 12RB7 | United States | New York | Limestone | Indian Res. Onondaga Co. |
| 5LA13 | United States | Ohio | Sandstone | New Lisbon |
| 6C | United States | Indiana | Limestone | ? |
| 7Lb42 | United States | New Hampshire | Granite | W. Concord |
| S1-1 | United States | Ohio | Sandstone | McDermott |
| 11LB21 | United States | Missouri | Limestone | Paris |
| 16WE | United States | Indiana | Limestone | Bedford |
| 5LB5 | United States | Ohio | Sandstone | Newburgh |
| 6RA38 | United States | North Carolina | Granite | Gaston Co. |
| 8LB26 | United States | North Carolina | Granite | Charlotte |
| S2-7 | United States | Ohio | Sandstone | McDermott |
| 10Lb36 | United States | Kansas | Sandstone | Pawnee |
| 13LA21 | United States | Iowa | Limestone | Quarry, Marshall Co. |
| 5LA14 | United States | Ohio | Sandstone | Columbus |
| 6EE | United States | Ohio | Sandstone | McDermott |
| 7LQ | United States | Tennessee | Marble | Knoxville |
| S1-10 | United States | Indiana | Limestone | Bedford |
| 5LB7 | United States | Ohio | Sandstone | N. Bloomfield |
| 6RA43 | United States | New Hampshire | Gneiss | Petersborough |
| 8Lb32 | United States | Texas | Sandstone | Riverside |
| S2-76 | United States | New Hampshire | Granite | Concord |
| 10LB43 | United States | New Hampshire | Granite | Hanover |
| 13LA27 | United States | Tennessee | Limestone | Nashville |
| 5LA16 | United States | Ohio | Sandstone | Windsor |
| 6LA25 | United States | Maine | Granite | Wayne |
| 7RA20 | United States | Ohio | Sandstone | Elyria |
| S1-11 | United States | Rhode Island | Granite | Westerly |
| 11LB30 | United States | Missouri | Sandstone | Butler |
| 5RA11 | United States | Ohio | Sandstone | Lithopolis |
| 6RA47 | United States | Wisconsin | Quartzite | Waterloo |
| 8LB39 | United States | West Virginia | Sandstone | Wheeling |
| S2-77 | United States | New Hampshire | Granite | Concord |
| 10LB45 | United States | New Hampshire | Granite | Plymouth |
| 13LB27 | United States | Tennessee | Limestone | Cowan |
| 5LA21 | United States | North Carolina | Gneiss | Greensborough |
| 6LA27 | United States | Maine | Granite | Swanville |
| 7RA23 | United States | North Carolina | Granite | Gastonia |
| S1-17 | United States | Unknown | Granite | Unknown |
| 11LB31 | United States | Kansas | Sandstone | Pawnee |
| 1Lq | United States | Missouri | Limestone | Carthage |
| 5RA12 | United States | Ohio | Sandstone | Euclid |