| Label | Dataset | Type | Subdivision | Identifier | |
|---|---|---|---|---|---|
| 1. | Sewage--Purification--Nitrogen removal |
LC Subject Headings (LCSH) |
ComplexSubject ComplexType Authority |
sh85120485 | |
| Nitrogen removal (Sewage purification) | |||||
| 2. | Water--Purification--Nitrogen removal |
LC Subject Headings (LCSH) |
ComplexSubject ComplexType Authority |
sh85145493 | |
| Nitrogen removal (Water purification) | |||||
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