Data processing of radioisotope images and H.P.A. Pesidential articles One published article on the data processing of radioisotope images. A letter to be published in H.P.A. Bulletin as the President of the association. An article submitted to the H.P.A. Bulletin and a registration form for a conference. These items were ordered together and numbered to be together within Professor Mallard's collection and encompass some of the activities he was engaged in during 1971. 1971