| Label | Dataset | Type | Subdivision | Identifier | |
|---|---|---|---|---|---|
| 1. | Protection | LC Subject Headings (LCSH) |
Topic SimpleType Authority |
General Subdivision | sh00005022 |
| 2. | Classification | LC Subject Headings (LCSH) |
Topic SimpleType Authority |
General Subdivision | sh2002012034 |
| 3. | Research | LC Subject Headings (LCSH) |
Topic SimpleType Authority |
General Subdivision | sh2002006576 |
| 4. | Transportation | LC Subject Headings (LCSH) |
Topic SimpleType Authority |
General Subdivision | sh2001008994 |
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