About: http://webisa.webdatacommons.org/77521699

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	Each chart is a PDF file; these are readable on any computer using Adobe's free Acrobat Reader software, version 3.0 or later, and can be printed out for use at the telescope.
http://www.w3.org/ns/prov#wasQuotedFrom	skyandtelescope.com