| HD - AMTRAK: Correspondence, 2003 - 2009 | 2003 - 2009 | 216 |
| HD - Rail Service: Correspondence, 2003 - 2008 | 2003 - 2008 | 225 |
| HD - Water Travel (boating): Correspondence, 2003 - 2010 | 2003 - 2010 | 229 |
| HD - VAST (snowmobiles): Correspondence, 2004 - 2007 | 2004 - 2007 | 228 |
| HD - Travel Information: Correspondence, 2003 - 2007 | 2003 - 2007 | 227 |
| HD - Rights of Way: Correspondence, 2004 - 2009 | 2004 - 2009 | 226 |
| HD - Rail Service: Correspondence, 2003 - 2007 | 2003 - 2007 | 224 |
| HD - Rail Service: Correspondence, 2003 - 2008 | 2003 - 2008 | 223 |
| HD - Essential Air Service: Correspondence, 2003 | 2003 - 2003 | 222 |
| HD - Commuter Rail: Correspondence, 2003 - 2007 | 2003 - 2007 | 219 |
| HD - Bridges: Correspondence, 2003 - 2009 | 2003 - 2009 | 217 |
| HD - Airports: Correspondence, 2003 - 2007 | 2003 - 2007 | 215 |
| HD - Rail Service: Correspondence, 2010 | 2010 - 2010 | 1564 |
| HD - ISTEA: Correspondence, 2004 | 2004 - 2004 | 1562 |
| HD - Air Service: Correspondence, 2003 | 2003 - 2003 | 1561 |
| HD - Local Transit Problems: Correspondence, 2005 - 2008 | 2005 - 2008 | 1563 |
| HD - Bridges: Correspondence, 2003 - 2004 | 2003 - 2004 | 218 |
| HD - Planning Division: Post Cards | - | 1565 |
