| # | Reference code | Title | Dates | Access restrictions |
|---|---|---|---|---|
| 1 | 2006.20.2 | Buildings and Structures | ca. 1962 | See item level descriptions for any restrictions. |
| 2 | 2006.20.3 | Exploration, Discovery & Travel | None | |
| 3 | 2006.20.9 | Transportation and Utilities | [ca. 1897 - 1960] | None |
| 4 | 2006.20.10 | Industries | [ca. 1900 - 1940] | None |
| 5 | 2006.20.11 | Geographic Features | [ca. 1890 - 1940] | None |
| 6 | 2006.20.12 | Military | ca. 1940 | None |