Discovering Lewis & Clark
Discovering Lewis & Clark: Portage Route Survey
Features an example of a route survey conducted by William Clark in 1805 of the falls, rapids, cascades and ravines from the lower portage camp to the upper falls (Black Eagle) and beyond, using a circumferentor (surveyor's compass) to...
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History.com: 11 Innovations That Changed History
From pioneering inventions to bold scientific and medical advancements, find out more about 11 innovations that changed the course of human history.
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