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Stone description: gray
| Wall Number | Country | State Sort descending | Classification | Source |
|---|---|---|---|---|
| 11LA29 | Italy | Marble | Serravezza | |
| 11LB25 | Italy | Sandstone | Leghorn | |
| 1L14 | Italy | Marble | Carrara | |
| 1L6 | Canada | Granite | Halifax Co. | |
| 1R14 | Italy | Marble | Carrara | |
| 8RA2 | Portugal | Limestone | Freguesias, Coimbra | |
| 11LB43 | Canada | Sandstone | Cliffton, New Brunswick | |
| 11RA33 | Italy | Marble | Serravezza | |
| 9LA15 | Siam (Thailand) | Marble | ? | |
| 10LA17 | Australia | Marble | South Australia | |
| 14LA32 | Austria | Marble | Trent | |
| 3l10 | Australia | Marble | New South Wales | |
| 7RB9 | Austria | Marble | Adnet | |
| 3R10 | Australia | Marble | New South Wales | |
| 7LB11 | Austria | Marble | Nabresina | |
| 10RB35 | Mexico | Pumice | San Juan, Pueblo State | |
| 12LA27 | Italy | Marble | Serravezza | |
| 4L1 | Italy | Marble | Carrara | |
| 14RA31 | Austria | Marble | Karst | |
| 5LB26 | Austria | Granite | Neuhaus | |
| 4R1 | Italy | Marble | Carrara | |
| 12RA26 | Italy | Marble | Serravezza | |
| 8LB1 | Portugal | Marble | Alvrite, Coimbra | |
| 9RA32 | Italy | Sandstone | Leghorn | |
| 5EE | United States | Alabama | Limestone | Rockwood |
| S3-4 | United States | Alabama | Marble | Rockwood |
| 9LB36 | United States | Alabama | Sandstone | Greensport |
| S2-148 | United States | Georgia | Marble | Tate |
| 13LB42 | United States | Illinois | Limestone | Iuka |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 8La11 | United States | Illinois | Limestone | Belknap |
| 14RB3 | United States | Illinois | Dolomite | Chicago |
| 16EE | United States | Indiana | Limestone | Bedford |
| 16WE | United States | Indiana | Limestone | Bedford |
| 6C | United States | Indiana | Limestone | ? |
| S1-10 | United States | Indiana | Limestone | Bedford |
| 8RA15 | United States | Indiana | Limestone | Putnamville |
| 24WE | United States | Indiana | Limestone | Bedford |
| S3-1 | United States | Indiana | Limestone | Bedford |
| 28WE | United States | Indiana | Limestone | Bedford |
| S3-2 | United States | Indiana | Limestone | Bedford |
| S1-8 | United States | Indiana | Limestone | Bedford |
| 29WE | United States | Indiana | Limestone | Bloomington |
| S1-9 | United States | Indiana | Limestone | Bedford |
| 10C | United States | Indiana | Limestone | Bloomington |
| 14C | United States | Indiana | Limestone | Bedford |
| S2-128 | United States | Indiana | Limestone | Bedford |
| S3-8 | United States | Indiana | Limestone | Bedford |
| 14EE | United States | Indiana | Limestone | Bedford |
| S2-130 | United States | Indiana | Limestone | Bedford |
| 30WE | United States | Indiana | Limestone | Bloomington |
| 31WE | United States | Indiana | Limestone | Bloomington |
| 12EE | United States | Indiana | Limestone | Bedford |
| 14RB1 | United States | Indiana | Dolomite | Bluffton |
| S2-4 | United States | Indiana | Limestone | Bedford |
| 11C | United States | Indiana | Limestone | Lawrence Co. |
| 15EE | United States | Indiana | Limestone | Bedford |
| 13LA21 | United States | Iowa | Limestone | Quarry, Marshall Co. |
| 13RA13 | United States | Iowa | Dolomite | Humbolt |
| 13RA21 | United States | Iowa | Limestone | Bentonsport |
| 14LA21 | United States | Iowa | Limestone | Marble Rock |
| 10LA18 | United States | Iowa | Limestone | Marshalltown |
| 9LB12 | United States | Iowa | Limestone | Earlham |
| 14LB20 | United States | Iowa | Limestone | Knoxville |
| 10LA20 | United States | Iowa | Limestone | Iowa Falls |
| 9LB14 | United States | Iowa | Limestone | Fairfield |
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 9RA10 | United States | Iowa | Limestone | Ottumwa |
| 9RA12 | United States | Iowa | Limestone | Iowa City |
| 12LB16 | United States | Iowa | Dolomite | Cedar Falls |
| 14RB14 | United States | Iowa | Limestone | Le-Grand |
| 14RB20 | United States | Iowa | Limestone | Winterset |
| 11La14 | United States | Iowa | Limestone | Charles City |
| 9RB11 | United States | Iowa | Limestone | Givin |
| 10Lb36 | United States | Kansas | Sandstone | Pawnee |
| 11LB31 | United States | Kansas | Sandstone | Pawnee |
| 10RA31 | United States | Kansas | Sandstone | Parsons |
| S2-125 | United States | Kansas | Limestone | Cottonwood |
| 14LB26 | United States | Kansas | Limestone | Irving |
| 10LB12 | United States | Kansas | Dolomite | Topeka |
| 9RA13 | United States | Kansas | Limestone | Lane |
| 12RB38 | United States | Kentucky | Limestone | Taylorsville |
| 6La30 | United States | Kentucky | Sandstone | Livingstone |
| 8RB31 | United States | Kentucky | Sandstone | Blue Lick Mountain |
| 8LA16 | United States | Kentucky | Limestone | Springfield |
| 12LB12 | United States | Kentucky | Dolomite | Louisville |
| 7LB28 | United States | Kentucky | Sandstone | Taylor Co. |
| 16B | United States | Maine | Granite | Frankfort |
| S2-51 | United States | Maine | Granite | Frankfort |
| 10LB29 | United States | Maine | Granite | St. Thomaston |
| 9RB23 | United States | Maine | Granite | Hurricane Isl. |
| 10Lb31 | United States | Maine | Granite | W. Sullivan |
| 6LA25 | United States | Maine | Granite | Wayne |
| 6LA27 | United States | Maine | Granite | Swanville |
| 5LA24 | United States | Maine | Granite | S. Brookville |
| 6RB27 | United States | Maine | Granite | Franklin |
| 5LA25 | United States | Maine | Granite | Frankfort |
| 5RA26 | United States | Maine | Granite | Biddeford |
| 5RA27 | United States | Maine | Granite | Biddeford |
| 7RB23 | United States | Maine | Gneiss | Jefferson |