ICOADS Web information page (Wednesday, 06-May-2009 23:50:40 UTC):
Release 2.5 RHUM Coverage MapsNote: Counts for the three partial decades (1854-59, 2000-06, and 2000-07) were adjusted (/10 x years) to be comparable to the full decades (also the January-May 2007 portion of Release 2.4 was not plotted).
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Updated: May 6, 2009 23:50:40 UTC