Lang, Stackpole & Pope was an early 19th-century business partnership that played a key role in establishing large-scale woolen manufacturing in North Vassalboro, Maine. Formed around 1836 by John D. Lang, Peter Morrill Stackpole, and Alton Pope, the firm grew from a small wool carding and cloth-dressing operation into a full woolen mill. They produced woolen cloth, including cassimere and other fabrics for clothing, first serving local farmers and later supplying markets throughout Maine and New England. The mill gained recognition for its quality, notably when a blue cassimere fabric won a gold medal at the 1851 London World’s Fair. As the business expanded, it reorganized as the North Vassalboro Woolen Manufacturing Company in 1855 and was eventually absorbed into the American Woolen Company when that corporation was formed and acquired the mill in 1899.