Mary Hreha of 534 Woodward Ave.;North Charleroi;died Wednesday;April 29;1987;in Mon Valley Hospital. She was 78. Mrs.Hreha was born April 11;1919;in East Charleroi;a daughter of the late Nicholas and Susanna Pipic Volosin. She was a member of Bethlem United Church of Christ;Send A Light Missionary Society;the Senior Citizens and Golden Agers;all of Charleroi. In addition to her parents;she was preceded in death by a son;Robert Hreha;and by two brothers;John and Nicholas (Mike) Volosin. Survivors include her husband;Mike Hreha;a son;Michael Hreha of Roscoe;a daugher Betty Riesmeyer of Canonsburg;8 grandchildren and 10 great-grandchildren;a brother;Andrew Volosin of Charleroi and a sister;Anna Bliss of Cleveland;Ohio. Friends will be received Friday from 2 to 4 and 7 to 9 p.m.in the Schrock-Hogan Funeral Home;226 Fallowfield Ave.;Charleroi;where services will be held Saturday;May 2;at 11 a.m.with Rev.George Jarvis;pastor of Bethlem United Church of Christ;Charleroi;officiating. Burial will be in Belle Venon Cemetery. The Schrock-Hogan Funeral Home Inc.is in charge of arrangements.