3.A.1.4.1.a TN sources (domestic)

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See also

3.A.1.4 TN sources (summary) 3.A.1.4.a 3.A.1.4.b
3.A.1.4.1.b TN sources (domestic)
3.A.1.2.1.a BOD sources (domestic)
3.A.1.3.1.a TSS sources (domestic)
3.A.1.5.1.a TP sources (domestic)