About: http://webisa.webdatacommons.org/123022243

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	Using the aerial photos and map dimensions subtracting scaled stages, booths and other police and rally stages and tents that allowed for over 400,000 assuming 4 square feet per attendee making the rally a minimum of 400,000.
http://www.w3.org/ns/prov#wasQuotedFrom	washingtonpost.com