Vermont Historical Society collections manager Katie Grant and executive director Stephen Perkins unbox a globe — made in 1810 by James Wilson of Bradford — for a “50 for 250” U.S. semiquincentennial exhibit in Montpelier. Photo by Kevin O’Connor/VTDigger MONTPELIER — A century-old pair of ash and rawhide snowshoes — embodying subsistence and sport — seemed an obvious choice when the Vermont Historical Society perused its 30,000 artifacts to pic…