 | 990-1 | 1 | Trees and Signs (1971 version with granulated trees and 4 bricks) | 1971 | Supplemental | 12 |
 | 990-2 | 1 | Trees and Signs (1969 version with old style trees and 3 bricks) | 1969 | Supplemental | 12 |
| 990-1 | 2 | Trees and Signs (1971 version with granulated trees and 4 bricks) | 1971 | Supplemental | 12 |
 | DBASE-1 | 1 | Database Set for Set 491-2 | 1966 | Database Sets | 14 |
