About: http://webisa.webdatacommons.org/15520572

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The principal cargo for most schooners on Lake Michigan was lumber, which fed the high demand for building materials in growing urban areas such as Chicago and Milwaukee.
http://www.w3.org/ns/prov#wasQuotedFrom	archives.gov