| Number | Date | Country | Kind |
|---|---|---|---|
| 2000-1359 | May 2000 | CA |
| Number | Name | Date | Kind |
|---|---|---|---|
| D. 245340 | Johnson | Aug 1977 | |
| D. 403437 | Risi et al. | Dec 1998 | |
| D. 403785 | Risi et al. | Jan 1999 | |
| 1086975 | Aaronson | Feb 1914 | |
| 1262308 | Colt | Apr 1918 | |
| 1495022 | Langer | May 1924 | |
| 6145266 | VonDross | Nov 2000 |
| Entry |
|---|
| Sweet's General Building and Renovation Catalog, 1993: Buyline 02276/RIS, Risi Stone Retiaing Wall System, Revers-A-Blok (R), p. 9.* |
| Harris, Cyril M.; Illustrated Dictionary of Historic Architecture; New York: Dover Publications, Inc., 1977: “Sunk Draft”, p. 513. |