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<br />Cover photograph credits: <br /> <br />Top, Colorado River near the Colorado-Utah State Line. (Photograph by Scott Mize, U.S. Geological Survey) <br /> <br />Lower left, photograph of Oscillatoria sp. by David Krogmann (Purdue University), Mark Schneegurt (Wichita State <br />University). <br />Accessed at Cyanosite (URL http://www-cyanosite.bio.purdue.edu/index.html) <br /> <br />Lower center, photograph of Lyngbya sp. by Rolf Schauder (Universittit of Frankfurt), Mark Schneegurt (Wichita <br />State University). <br />Accessed at Cyanosite (URL http://www-cyanosite.bio.purdue.edu/index.html) <br /> <br />Lower right, photograph of Navicula sp. by Rex L. Lowe (Bowling Green State University). <br />Accessed at Bowling Green State University Center for Algal Microscopy and Image Digitization website <br />(U RL http://www.bgsu.edu/departments/biology/algae/index.html) <br />