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How Do We All Get Around? 
his map uses conventional contour line symbols to indicate elevation above sea level (note the numbers on some of the lines). A contour line is an "isoline," connecting points of equal value. Elevations are also given as fixed points: the elevation of Swan Lake Valley is 4270 feet above sea level.
From Discovering
Lewis & Clark ®, http://www.lewis-clark.org
© 1998-2009 VIAs Inc.
© 2009 by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983–2001)
© 2009 by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983–2001)