| Label | Vocabulary | Concept | Subdivision | Identifier | |
|---|---|---|---|---|---|
| 1. | Defects | LC Subject Headings (LCSH) |
General Subdivision | sh99005477 | |
| 2. | Defects--Reporting | LC Subject Headings (LCSH) |
General Subdivision | sh99005479 | |
| 3. | Environmental aspects | LC Subject Headings (LCSH) |
General Subdivision | sh99005383 | |
| 4. | Corrosion | LC Subject Headings (LCSH) |
General Subdivision | sh99005345 | |
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