United States. Weather Bureau. Daily synoptic series, historical weather maps. U.S. Weather Bureau.
Lua i Stíl Chicago (17ú heag.)United States. Weather Bureau. Daily Synoptic Series, Historical Weather Maps. Washington, D.C.: U.S. Weather Bureau.
Lua MLA (8ú heag.)United States. Weather Bureau. Daily Synoptic Series, Historical Weather Maps. U.S. Weather Bureau.
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