Memorial Day: Among post-9/11 veterans, deepening antiwar sentiment - Christian Science Monitor
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UN official: More than 90 dead in Syria, many of them children - Los Angeles Times
OECD Glossary of Statistical Terms - Period (interval) Definition
The period is the reciprocal of the frequency. More loosely, the expression is used to denote the time interval or average interval between identifiable points of recurrence, e.g ...
http://stats.oecd.org
