| Call Number (LC) | Title | Results |
|---|---|---|
| I 29.21:D 46/2017 | De Soto National Memorial, Florida | 1 |
| I 29.21:D 49/4/2022 | Devils Tower National Monument, Wyoming | 1 |
| I 29.21:D 49/8 | Devils Postpile National Monument, California : official map and guide | 1 |
| I 29.21:D 61/2/958 | The dinosaur quarry. Dinosaur National Monument, Colorado-Utah | 1 |
| I 29.21:D 61/3 | Dinosaur : learning about dinosaurs | 1 |
| I 29.21:D 61/4 | Dinosaur hiking trails | 2 |
| I 29.21:D 61/5 |
Dinosaur petroglyphs and pictographs Dinosaur : petroglyphs and pictographs |
2 |
| I 29.21:D 61/6 | Dinosaur : Josie Bassett Morris | 1 |
| I 29.21:D 61/7/2016 | Dinosaur : fossil discovery trail | 1 |
| I 29.21:D 61/2023 | Dinosaur : Dinosaur National Monument, Colorado/Utah | 1 |
| I 29.21:EF 4/2/995 | Effigy mounds : official map and guide : National Monument, Iowa | 1 |
| I 29.21:EI 8 | Dwight D. Eisenhower Memorial | 1 |
| I 29.21:EL 1/5/2019 | El Malpais National Monument, New Mexico | 1 |
| I 29.21:El 1/6 | El Morro official map and guide : national monument, New Mexico | 1 |
| I 29.21:EL 1/7 | EL Morro National Monument, New Mexico | 1 |
| I 29.21:EL 5 | Ellis Island : National Monument, New York | 1 |
| I 29.21:EL 5/4/2018 | Statue of Liberty National Monument, New York-New Jersey | 1 |
| I 29.21:ER 4 | Erie Canalway | 1 |
| I 29.21:F 31/2016 | Federal Hall National Memorial, New York | 1 |
| I 29.21:F 64/2021 | Flight 93 National Memorial, Pennsylvania | 1 |