| Number | Date | Country | Kind |
|---|---|---|---|
| 111890 | Jul 1981 | CHX |
| Number | Date | Country |
|---|---|---|
| 2440177 | Mar 1976 | DEX |
| 2277936 | Feb 1976 | FRX |
| Entry |
|---|
| Sweet's Architectural Catalog File, 1978, 4.1/Co, p. 8, Paving illustration (River Oaks) at top right. |
| Pictoria), Concrete Masonry/Paving Block Publication, .COPYRGT.1980, p. 7, bottom right. |