His 1974 O'Donnell lecture ( published in 1975 ) was a ground breaking study of that community .
His 1974 O'Donnell lecture ( published in 1975 ) is the formation of the Old - English elite in Ireland .
His 1974 O'Donnell lecture ( published in 1975 ) , The formation of the Old - English elite in Ireland , was a ground breaking study of that community .