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Stone description: light gray
| Wall Number | Country | State Sort ascending | Classification | Source |
|---|---|---|---|---|
| 12LB35 | United States | Indiana | Limestone | Bedford |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 11La1 | United States | Indiana | Dolomite | St. Paul |
| 14RB12 | United States | Indiana | Limestone | Oakdale |
| 9RB39 | United States | Indiana | Sandstone | Paoli |
| 9RB40 | United States | Indiana | Sandstone | Attica |
| 12RA32 | United States | Indiana | Limestone | Salem |
| 13RB2 | United States | Illinois | Dolomite | Joilet |
| 14RB4 | United States | Illinois | Dolomite | Kankakee |
| 12RA4 | United States | Illinois | Limestone | Quincy |
| 13RB38 | United States | Illinois | Limestone | Sagetown |
| 13RB39 | United States | Illinois | Limestone | Columbia |
| 13LA2 | United States | Illinois | Dolomite | Lemont |
| 11RA3 | United States | Illinois | Dolomite | Lemont |
| 14LA2 | United States | Illinois | Dolomite | Aurora |
| 11RB1 | United States | Illinois | Dolomite | Joilet |
| 14LA3 | United States | Illinois | Dolomite | Joilet |
| 9LA41 | United States | Illinois | Sandstone | Chester |
| 13LB2 | United States | Illinois | Dolomite | Lemont |
| 8LA12 | United States | Illinois | Limestone | Kinderhook |
| 12LA3 | United States | Illinois | Dolomite | Joilet |
| 12LA31 | United States | Illinois | Limestone | Joliet |
| 13RA2 | United States | Illinois | Dolomite | Lemont |
| 12LA32 | United States | Illinois | Limestone | Jonesborough |
| 9RA42 | United States | Illinois | Sandstone | Xenia |
| 14RA2 | United States | Illinois | Dolomite | Joilet |
| 12RA3 | United States | Illinois | Dolomite | Chicago |
| 8RA10 | United States | Illinois | Limestone | Chester |
| 12RA30 | United States | Illinois | Limestone | Joliet |
| 8RA11 | United States | Illinois | Limestone | Rockport |
| 8RA12 | United States | Illinois | Limestone | Jonesborough |
| 5LB30 | United States | Georgia | Granite | Ogelsby |
| 12RB40 | United States | Alabama | Limestone | Turks Cave |
| 2c | United States | Alabama | Limestone | Rockwood |
| 13rb46 | United States | Alabama | Limestone | Leighton |
| 7ra8 | United States | Alabama | Limestone | Dickson |
| 7RA9 | United States | Alabama | Limestone | Tuscumbia |
| 12LA37 | United States | Alabama | Limestone | Trinity |
| 13RA47 | United States | Alabama | Limestone | Rockwood |
| 14RB36 | Spain | Limestone | Murcia, Murcia | |
| 10LB39 | Mexico | Pyrophyllite | Sonora State | |
| 10RA29 | Mexico | Andesite | Ixtapalapa | |
| 14LA45 | Portugal | Limestone | Ega, Coimbra | |
| 14LA46 | Portugal | Limestone | Janianes, Coimbra | |
| 8LA2 | Portugal | Marble | Ameixoira, Coimbra | |
| 9LB33 | Mexico | Pyrophyllite | Sonora State | |
| 13RA25 | Cuba | Marble | Isle of Pines | |
| 9RB31 | Mexico | Pyrophyllite | Sonora State | |
| 8RA1 | Portugal | Marble | Ponde do Espinal, Coimbra |