Houston American Energy Announces Termination of Interest in CPO 4 Concession and Mutual Release with SK Innovation

[PR Newswire] – HOUSTON, March 28, 2013 /PRNewswire/ — Houston American Energy Corp (NYSE MKT: HUSA) announced on December 10, 2012 that it was evaluating its future plans and alternatives regarding the CPO 4 block. … more

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