About: http://webisa.webdatacommons.org/137315878

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	In the United States, in early years, up to the beginning of the 20th century, lettuce consumption was distributed among all types, but principally among butterhead, leaf, and American Batavia types.
http://www.w3.org/ns/prov#wasQuotedFrom	purdue.edu