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1st Training Centre (Polish: 1 Osrodek Szkolenia Lotniczego - 1.OSL) is a training unit of Polish Air Force directly under command of Polish Air Force Academy.
Following successful construction and operation of the St. Anthony Railroad, Union Pacific, under the careful watch of the OSL and the Yellowstone Park Railroad Company, began plans for another railroad from St. Anthony to the Madison River entrance of Yellowstone National Park or to what is now known as West Yellowstone.
OSL employs methods such as ‘enactive’ learning, ‘kinaesthetic’ learning and the various styles of teaching developed by practitioners such as Augusto Boal and Paulo Freire.
Logging helped to spur even more people to move into the area, and in 1911, the Idaho Northern Railroad was constructed by the OSL, running from Emmett near the mouth of the Payette along the river, past present-day Black Canyon Reservoir, up into the North Fork watershed and ending just below Long Valley at Smith's Ferry on the river, named for a settler who bought the operation in 1891.
The art is no older than 9–10 millennia, according to OSL dating of associated sediments, but may be younger.