The nnn97qw files have the following parameters:

90095 Lab Specific Conductance (uS/cm)
00613 Nitrogen NO2 Dissolved (mg/L)
00615 Nitrogen NO2 Total (mg/L)
00631 Nitrogen NO2+NO3 Dissolved (mg/L)
00630 Nitrogen NO2+NO3 Total (mg/L)
00608 Nitrogen NH3 Dissolved (mg/L)
00610 Nitrogen NH3 Total (mg/L)
00623 Nitrogen NH3+ORG Dissolved (mg/L)
00625 Nitrogen NH3+ORG Total (mg/L)
00666 Phosphorus as P Dissolved (mg/L)
00665 Phosphorus as P Total (mg/L)
00671 Phosphorus PO4 Dissolved (mg/L)
70507 Phosphorus PO4 Total (mg/L)