enrollment of this class in 1917 at the beginning of its senior year had dropped to a little over 2.000.
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fOB TEN TEARS ENDING
National RftourcM Committee, "Report of Water Planning Committee, Part III," 1934.
SCALE .7
B. Ten-Year Moving Averages of Annual Precipitation for Marietta, Ohio, and St. Paul, Minnesota, from 1 840 to 1931.
This chart differs from 288B and 289 in that it is a moving average "for ten years ending" rather than for ten years "centered."