About: http://webisa.webdatacommons.org/303559876

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	There are letters to Whitman from family members, his biographer Richard Maurice Bucke, and journalists and writers, including Samuel Clemens, John Camden Hotten, William Douglas O'Connor, Allen Thorndike Rice, and Algernon Swinburne.
http://www.w3.org/ns/prov#wasQuotedFrom	yale.edu