Thomas, Mary Elizabeth ?Libby?, 79, of St. Petersburg, died Saturday, August 26, 2000. Born in Shreveport, LA, she moved here in 1965 from Big Springs, TX. She was a secretary for a dental office in St. Petersburg for 12 years. Libby was a member of Maximo Presbyterian Church in St. Petersburg. Survivors include one son: Robert C.K. ?Bob? Thomas of St. Petersburg. Anderson McQueen Funeral Homes and Cremation Tribute Center-Ninth St. Chapel ? St. Petersburg.