The Panda British Guiana Postmark Catalog(1831 – 22 Jan 1901) By Paul A. Ramsaroop in collaboration with the Guyana Philatelic Society.I am compiling a comprehensive catalog of British Guiana date-stamps used on pre-adhesive envelopes from the colony's formation in 1831—when Essequibo, Demerara, and Berbice were unified—through the issuance of adhesive stamps beginning in 1850, and concluding…