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SCIENCE RESEARCH
	USGS: U.S. Geological Survey "As the Nation's largest water, earth, and biological science and civilian mapping agency, the U.S. Geological Survey (USGS) collects, monitors, analyzes, and provides scientific understanding about natural resource conditions, issues, and problems."

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	Full Text Available - These electronic resources offer the full text of some (if not all) items.
	Restricted Access - These electronic resources may only be used by PHC students, faculty, and staff.