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Rocky Mountain spotted fever (or "black measles" because of its characteristic rash) was recognized in the early 1800s, and in the last 10 years of the 1800s (1890–1900) it became very common, especially in the Bitterroot Valley of Montana. The disease was originally noted to be concentrated on the west-side of the Bitterroot river. [31]
- Rocky Mountain Wood Tick
Dermacentor andersoni, commonly known as the Rocky Mountain...
- Howard T. Ricketts
"A summary of investigations of the nature and means of...
- Rocky Mountain Wood Tick
May 15, 2024 · Rocky Mountain spotted fever is a serious tickborne illness which can be deadly if not treated early. It is spread by several species of ticks in the United States, including: American dog tick ( Dermacentor variabilis) Brown dog tick ( Rhipicephalus sanguineus) - parts of southwestern United States and Mexico.
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Lawson's map of the Gold Regions is the first map to accurately depict California's Gold Regions. Issued in January 1849, at the beginning of the California gold rush, Lawson's map was produced specifically for prospectors and miners. A Correct Map of the Bay of San Francisco and the Gold Region from actual Survey June 20th. 1849 for J.J. Jarves.
Map of California topography and geomorphic provinces California's major mountain ranges California is a U.S. state on the western coast of North America . Covering an area of 163,696 sq mi (423,970 km 2 ), California is among the most geographically diverse states.
This map shows the perimeters of more than 20,000 wildfires that have been recorded in California from 1878 to 2020 using data from Cal Fire, the National Parks Service, the U.S. Forest...
November 10, 1846. Website. www .nps .gov /mopi. The Mormon Trail is the 1,300-mile (2,100 km) long route from Illinois to Utah on which Mormon pioneers (members of the Church of Jesus Christ of Latter-day Saints) traveled from 1846–47. Today, the Mormon Trail is a part of the United States National Trails System, known as the Mormon Pioneer ...
Journey back in time with 16,595 historical maps of California, dating from 1886 to present day. Explore and discover the history of California through detailed topographic maps, featuring cities, landmarks, and geographical changes.
