O'Dwyer / Fitzgerald

Hi! I am looking for a record of the marriage of a Mr O'Dwyer (possibly John, or James) to a Miss Fitzgerald (probably either Mary or Kathleen). I know of three of their children, but there might have been more. The children's birthdates are approximately Kathleen (1872), James Edward (1875) and John (1878). These children might be registered under the surname, Burton. Any assistance will be welcomed.