->  codebook


sample ---------------------------------------------------------- Sample number
                  type:  numeric (byte)

                 range:  [1,15]                       units:  1
         unique values:  15                   coded missing:  0 / 15

                  mean:         8
              std. dev:   4.47214

           percentiles:        10%       25%       50%       75%       90%
                                2         4         8        12        14


depth ------------------------------------------------------ Overburden in Feet
                  type:  numeric (int)

                 range:  [175,1440]                   units:  1
         unique values:  15                   coded missing:  0 / 15

                  mean:   682.467
              std. dev:   413.486

           percentiles:        10%       25%       50%       75%       90%
                              252       356       556       892      1439


gas ------------------------------------------------------- Gas Content, cm^3/g
                  type:  numeric (float)

                 range:  [2.5,17.5]                   units:  .1
         unique values:  13                   coded missing:  0 / 15

                  mean:   12.0867
              std. dev:   4.30745

           percentiles:        10%       25%       50%       75%       90%
                              5.7      10.8      11.8      16.7      17.1

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