346
<br />Acknowledgments
<br />MARSH AND DOUGLAS
<br />Collections were under permit authority of Ar-
<br />izona Game and Fish Department, Navajo Fish and
<br />Wildlife Department, Grand Canyon National Park
<br />(National Part Service), and U.S. Fish and Wildlife
<br />Service. We thank B. Bagley, J. Cook, C. Minck-
<br />ley, R. Mose, P. Ryan, and numerous others. W.
<br />Minckley reviewed an earlier draft of the manu-
<br />script. Work was carried out under U.S. Bureau of
<br />Reclamation contract BOR-I-FC-90-10490 to Ar-
<br />izona State University.
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<br />Received July 28, 1993
<br />Accepted July 9, 1996
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