International trade 1 International trade--19th century 1 Medical education 1 Merchants 1 Mills and mill-work 1 Pennsylvania--History 1 Pennsylvania--History--1775-1865 1 more ... Pennsylvania--History--Colonial period, ca. 1600-1775 1 Quaker women 1 Quakers 1 United State--History--Colonial period, ca. 1600-1775 1 United States--History--Revolution, 1775-1783 1 less ...