Stamper Engages Petrotech Engineering to Prepare a NI 51-101 - Standards of Disclosure for Oil and Gas Activities on Joropo Concessions, Colombia VANCOUVER, British Columbia, May 09, 2017 (GLOBE NEWSWIRE) -- Stamper Oil & Gas Corp. (TSX-V:STMP) (FSE:TMP2) (OTCQB:AZUEF) (“Stamper” or “the Company”), is pleased to announce it has engaged...