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.

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.

Consists of correspondence between Father Edward Leo Hayes, his sister Mary and his niece Jean as well as philatelic ephemera, unpublished poetry and artwork. The collection also contains academic robes worn by Father Hayes when he received an honorary Masters of Arts degree from the University of Queensland and a whiskey bottle from by General Douglas McArthur.