This file comprises 51 letters from Father Hayes to his sister Mary. Many of the letters have first day cover envelopes. Envelopes are often addressed to 'Mrs A. O. Brown' or 'Mrs Ambrose Brown'. Hayes frequently finishes with 'your loving brother'. There is an envelope with a newspaper cutting, another with an invitation and one with a mass list.

This file comprises 7 letters. Two letters with first day issues envelopes are circulars from the Royal Geographical Society of Australia (Queensland), dated 1955 and 1957. Two letters from E Galvin with first day cover envelopes, 1960 and 1963. Two handwritten letters from 'Nell' with souvenir envelopes, dated 1963. One handwritten letter from Nell to Mary mentioning enclosing the letter in a Henry Lawson first day of issue envelope; attached a Henry Lawson envelope addressed to Jean Brown, postmarked 1949.

Material consists mostly of correspondence from Father Hayes to his sister Mary (Mrs Ambrose Brown) and his niece Jean Brown. Other correspondence includes letters from Daniel Augustine O'Brien.