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directly. For all other joint sets, mean apparent spacings were estimated to provide an <br />indirect estimate of frequency distribution. <br />Four scanlines, with a total length of 2020 ft, were recorded in morphological zones 2, <br />3/4, 6l7, and 8/9. The locations of these are shown on Drawing 1, and analysis of the <br />results is discussed in detail in Section 3 below. <br />• <br />• <br />13 <br />