->  codebook


station --------------------------------------------------------------- Station
                  type:  numeric (byte)

                 range:  [1,7]                        units:  1
         unique values:  7                    coded missing:  0 / 7

            tabulation:  Freq.  Value
                             1  1
                             1  2
                             1  3
                             1  4
                             1  5
                             1  6
                             1  7


dist ---------------------------------------------- Distance from Discharge, km
                  type:  numeric (float)

                 range:  [2.6,10.8]                   units:  .1
         unique values:  7                    coded missing:  0 / 7

            tabulation:  Freq.  Value
                             1  2.5999999
                             1  4.4000001
                             1  5.0999999
                             1  5.5999999
                             1  7.1999998
                             1  9.8999996
                             1  10.8


high ---------------------------------------------------- Highest Chromium, ppm
                  type:  numeric (int)

                 range:  [44,221]                     units:  1
         unique values:  6                    coded missing:  0 / 7

            tabulation:  Freq.  Value
                             1  44
                             1  47
                             2  56
                             1  72
                             1  77
                             1  221

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