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e <br />FIGURES <br />1.1 Location map of the Colorado River <br />Basin 17 <br />1.2 Glen Canyon Environmental Studies <br />study area. 26 <br />1.3 Conceptual scheme of Glen Canyon <br />ecosystem components and their <br />interactions under present <br />operations of Glen Canyon Dam 31 <br />2.1 Steps in Bureau of Reclamation <br />decision process concerning the <br />Glen Canyon Environmental Studies 35 <br />3.1 Inputs and outputs of the Glen <br />Canyon/Grand Canyon River ecosystem 47 <br />3.2 Historical perspective of Glen Canyon <br />Dam and Lake Powell 50 <br />xvii <br />