About: http://webisa.webdatacommons.org/405274395

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 collection is a work in progress, but with the stamps from mine and Dave T's collections I was able to assemble a decent survey, with only one company cancel, that of Pomroy Brothers, missing between 1886-1912.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com