Robert W.Elder;a past member and past president of North Belle Vernon Borough Council;died suddenly Sunday;Jan.14;1979 at 12:15 p.m.in Mon Valley Hospital;Carroll Twp.  Mr.Elder;75;resided at 309 Henry St.;Belle Vernon.  Born in Star Junction;April 13;1903;he was the son of the late Alvin and Helen Whitelaw Elder.  Mr.Elder lived in the Belle Vernon area since 1936.  Mr.Elder was an employee of the Wheeling-Pittsburgh Steel;Monessen plant;retiring on March 4;1967;with 45 years of service.  He was a member of the First Christian Church;and was a former member of the Belle Vernon Public Library Board.  Mr.Elder is survved by his widow;Ruth Mossburg Elder;and one brother;A.W. (Ted) Elder of Fayette City.  In addition to his parents;he was preceded in death by a brother;Guy Elder;in Dec.1976;and a sister;Elsie Winters;in Dec.1970.  Friends will be received in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon;on Monday from 7 to 9 p.m.and Tuesday from 2 to 4 and 7 to 9 p.m.  Funeral services will be held in the funeral home Wednesday at 1 p.m.;with the Rev.Bruce E.Smith;pastor of the First Christian Church of Fayette City;officiating.  Interment will be in Belle Vernon Cemetery.  Shelby D.Ferguson;funeral director;is in charge of arrangements.