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GLEN CANYON ENVIRONMENTAL STUDIES <br />BASE MAP DEVELOPMENT <br />u, <br />SELECT MONITORING <br />SURVEY to ESTABLISH <br />SITES (13) <br />& SPECIAL STUDY SITES (4) <br />HORIZONTAL and VERTICAL <br />CONTROL <br />TRAVERSE <br />1: 7,200 B & W PHOTOS <br />PANEL POINTS <br />GPS <br />PHOTOGRAMMETRY <br />TOPOGRAPHIC MAPS <br />FINAL 1-r----; DRAFT <br />FEBRUARY I99S I <br />Figure 4. - GCES base map development.