| Call Number (LC) | Title | Results |
|---|---|---|
| I 29.21:H 18/2/2013 | Hamilton Grange / | 1 |
| I 29.21:H 18/967 | Hampton National Historic Site, Maryland. | 1 |
| I 29.21:H 18/975 | Hampton National Historic Site, Maryland. | 1 |
| I 29.21:H 19/975 | Hampton National Historic Site, Maryland. | 1 |
| I 29.21:H 23/2 | Harpers Ferry : official map and guide : Harpers Ferry National Historical Park, West Virginia, Maryland, Virginia. | 1 |
| I 29.21:H 23/2/968 | Harpers Ferry National Historical Park : West Virginia - Maryland. | 1 |
| I 29.21:H 23/2017 | Harpers Ferry, Harpers Ferry National Historical Park, West Virginia, Maryland, Virginia / | 1 |
| I 29.21:H 23/2020 | Harpers Ferry National Historical Park, West Virginia, Maryland, Virginia, National Park Service, 2020. | 1 |
| I 29.21:H 23/2022 | Harpers Ferry National Historical Park / Maryland / Virginia / W. Virginia, [2022] | 1 |
| I 29.21:H 41/973 | Herbert Hoover National Historic Site, Iowa. | 1 |
| I 29.21:H 62 | Historic furnishings plan synopsis : building 40 : Harpers Ferry National Historical Park, Harpers Ferry, West Virginia / | 1 |
| I 29.21:H 75/ | Homestead National Historical Park, Nebraska / | 1 |
| I 29.21:H 75/2014 | Homestead : Homestead National Monument of America, Nebraska / | 1 |
| I 29.21:H 75/2021 |
Homestead National Historical Park, Nebraska / Homestead National Historical Park, Nebraska, 2021. |
2 |
| I 29.21:H 77/2/940 | Hopewell Village National Historic Site, Pa. [descriptive leaflet] | 1 |
| I 29.21:H 77/2/975 | Hopewell Village National Historic Site, Pennsylvania / | 1 |
| I 29.21:H 77/949 | Hopewell Village National Historic Site, Pennsylvania. | 1 |
| I 29.21:H 78 | Horseshoe Bend National Military Park, Alabama : official guide and map. | 1 |
| I 29.21:H 78/969 | Horseshoe Bend National Military Park, Alabama. | 1 |
| I 29.21:H 78/971 | Horseshoe Bend National Military Park, Alabama. | 1 |
