National allergy forecast for USA cities. Today’s National Allergy Map. Search, browse and select cities on our interactive allergy map to see allergy levels and pollen count forecasts.
As the population expanded westward, many early settlers in the Montana foothills of the rugged Bitteroot Range of the Rocky Mountains were plagued with a disease known as "black measles," or "spotted fever," now known as Rocky Mountain spotted fever. In 1902, the U.S. Public Health Service sent out a research team to find the cause.
Rocky Mountain spotted fever (RMSF) is an infection caused by the bite of an infected tick. It affects over 2,000 people a year in the U.S. and usually occurs from April until September. But, it can occur anytime during the year where the weather is warm.
These maps can also be seen in the Gallery layer of Google Earth, Rumsey Historical Maps layer, and in the Google Earth viewers on this website. All the maps contain rich information about the past and represent a sampling of time periods (1680 to 1930), scales, and cartographic art, resulting in visual history stories that only old maps can tell.
It is convenient to split the yellow fever map into two, for the periods 1900–1959 and 1960–2005, but the records for dengue are more sparse in the early years of the last century and so only a single map is shown, covering the period 1960–2005.
Discover the past of the United States through vintage maps in our online collection of old historical maps that span over 300 years of growth. View US Maps such as historical country and state boundaries changes as well as old vintage maps for all 50 states in the US.
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Jan 21, 2015 · This map unites America's most famous cryptids on one map, from Caddy, a Northwestern sea serpent, over Nebraska's Alkali Lake monster to the skunk apes of Southern Florida.
Mar 30, 2020 · Gold fever kicked off there in earnest, however, after December 1848, when President James K. Polk announced the positive results of a report made by Colonel Richard Mason, California’s military ...
History Map Archive Search chronologically or by continent. WORLD MAPS AFRICA MAPS AMERICA MAPS: A - D AMERICA MAPS: E - N AMERICA MAPS: O - S AMERICA MAPS: T - Z ASIA MAPS: A - C ASIA MAPS: D - I ASIA MAPS: J - O ASIA MAPS: P - Z