Brief: PostRock Energy says expects field level cash flows of about $21.7 million by end of 2015 - SEC FILING
May 19 (Reuters) - PostRock Energy Corp PSTR.O : * Says expects field level cash flows of about $21.7 million by end of 2015 - SEC filing * Source text for Eikon ID:nEOL16K6Rj * Further company coverage PSTR.O ((Bengaluru Newsroom; +1 646 223 8780))